diff --git a/common/defaults/korea.ipv4.php b/common/defaults/korea.ipv4.php
new file mode 100644
index 000000000..d2ce958aa
--- /dev/null
+++ b/common/defaults/korea.ipv4.php
@@ -0,0 +1,3863 @@
+<?php
+
+/**
+ * Source: https://mirror.oops.org/pub/oops/libkrisp/data/v2/
+ * Last Updated: 2016-03-18
+ */
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+    0 => '3697737728',
+    1 => '3697803263',
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+    1 => '3699376127',
+  ),
+  751 => 
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+    1 => '3700817919',
+  ),
+  752 => 
+  array (
+    0 => '3706060800',
+    1 => '3706126335',
+  ),
+  753 => 
+  array (
+    0 => '3716431872',
+    1 => '3716440063',
+  ),
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+    0 => '3716493312',
+    1 => '3716497407',
+  ),
+  755 => 
+  array (
+    0 => '3716513792',
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+  ),
+  756 => 
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+    0 => '3716808704',
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+    0 => '3730833408',
+    1 => '3732602879',
+  ),
+  758 => 
+  array (
+    0 => '3739680768',
+    1 => '3739697151',
+  ),
+  759 => 
+  array (
+    0 => '3739746304',
+    1 => '3740270591',
+  ),
+  760 => 
+  array (
+    0 => '3741024256',
+    1 => '3741057023',
+  ),
+  761 => 
+  array (
+    0 => '3743055872',
+    1 => '3743088639',
+  ),
+  762 => 
+  array (
+    0 => '3743186944',
+    1 => '3743219711',
+  ),
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+  array (
+    0 => '3743416320',
+    1 => '3745513471',
+  ),
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+    0 => '3749855232',
+    1 => '3749969919',
+  ),
+  765 => 
+  array (
+    0 => '3752165376',
+    1 => '3752198143',
+  ),
+  766 => 
+  array (
+    0 => '3752329216',
+    1 => '3752853503',
+  ),
+  767 => 
+  array (
+    0 => '3754033152',
+    1 => '3754164223',
+  ),
+  768 => 
+  array (
+    0 => '3755868160',
+    1 => '3755933695',
+  ),
+  769 => 
+  array (
+    0 => '3757899776',
+    1 => '3757965311',
+  ),
+  770 => 
+  array (
+    0 => '3758080000',
+    1 => '3758088191',
+  ),
+);
diff --git a/common/defaults/korea.ipv6.php b/common/defaults/korea.ipv6.php
new file mode 100644
index 000000000..291776383
--- /dev/null
+++ b/common/defaults/korea.ipv6.php
@@ -0,0 +1,503 @@
+<?php
+
+/**
+ * Source: https://ip.kisa.or.kr/ip_cate_stat/stat_05_05.act
+ * Last Updated: 2016-03-18
+ */
+return array (
+  0 => 
+  array (
+    0 => '2001000000000000',
+    1 => '2001000fffffffff',
+  ),
+  1 => 
+  array (
+    0 => '2001022000000000',
+    1 => '20010220ffffffff',
+  ),
+  2 => 
+  array (
+    0 => '2001023000000000',
+    1 => '20010230ffffffff',
+  ),
+  3 => 
+  array (
+    0 => '2001027000000000',
+    1 => '20010270ffffffff',
+  ),
+  4 => 
+  array (
+    0 => '2001028000000000',
+    1 => '20010280ffffffff',
+  ),
+  5 => 
+  array (
+    0 => '2001029000000000',
+    1 => '20010290ffffffff',
+  ),
+  6 => 
+  array (
+    0 => '200102b000000000',
+    1 => '200102b0ffffffff',
+  ),
+  7 => 
+  array (
+    0 => '200102b800000000',
+    1 => '200102b8ffffffff',
+  ),
+  8 => 
+  array (
+    0 => '200102d800000000',
+    1 => '200102d8ffffffff',
+  ),
+  9 => 
+  array (
+    0 => '2001032000000000',
+    1 => '20010320ffffffff',
+  ),
+  10 => 
+  array (
+    0 => '2001033000000000',
+    1 => '20010330ffffffff',
+  ),
+  11 => 
+  array (
+    0 => '2001037800000000',
+    1 => '20010378ffffffff',
+  ),
+  12 => 
+  array (
+    0 => '2001039000000000',
+    1 => '20010390ffffffff',
+  ),
+  13 => 
+  array (
+    0 => '200103a800000000',
+    1 => '200103a8ffffffff',
+  ),
+  14 => 
+  array (
+    0 => '200107fa00000002',
+    1 => '200107fa00000002',
+  ),
+  15 => 
+  array (
+    0 => '200107fa00080000',
+    1 => '200107fa0008ffff',
+  ),
+  16 => 
+  array (
+    0 => '20010c4800000000',
+    1 => '20010c48ffffffff',
+  ),
+  17 => 
+  array (
+    0 => '20010c9800000000',
+    1 => '20010c98ffffffff',
+  ),
+  18 => 
+  array (
+    0 => '20010cf000000000',
+    1 => '20010cf0ffffffff',
+  ),
+  19 => 
+  array (
+    0 => '20010d3800000000',
+    1 => '20010d38ffffffff',
+  ),
+  20 => 
+  array (
+    0 => '20010dc500000000',
+    1 => '20010dc5ffffffff',
+  ),
+  21 => 
+  array (
+    0 => '20010dcc00000000',
+    1 => '20010dccffffffff',
+  ),
+  22 => 
+  array (
+    0 => '20010ea000000000',
+    1 => '20010ea0ffffffff',
+  ),
+  23 => 
+  array (
+    0 => '20010ea800000000',
+    1 => '20010ea8ffffffff',
+  ),
+  24 => 
+  array (
+    0 => '20010eb800000000',
+    1 => '20010eb8ffffffff',
+  ),
+  25 => 
+  array (
+    0 => '20010ed000000000',
+    1 => '20010ed0ffffffff',
+  ),
+  26 => 
+  array (
+    0 => '20010ee800000000',
+    1 => '20010ee8ffffffff',
+  ),
+  27 => 
+  array (
+    0 => '20010ef000000000',
+    1 => '20010ef0ffffffff',
+  ),
+  28 => 
+  array (
+    0 => '20010ef800000000',
+    1 => '20010ef8ffffffff',
+  ),
+  29 => 
+  array (
+    0 => '20010f2800000000',
+    1 => '20010f28ffffffff',
+  ),
+  30 => 
+  array (
+    0 => '20010f4800000000',
+    1 => '20010f48ffffffff',
+  ),
+  31 => 
+  array (
+    0 => '24033e0000000000',
+    1 => '24033e00ffffffff',
+  ),
+  32 => 
+  array (
+    0 => '2001443000000000',
+    1 => '20014430ffffffff',
+  ),
+  33 => 
+  array (
+    0 => '2400000000000000',
+    1 => '24000fffffffffff',
+  ),
+  34 => 
+  array (
+    0 => '2400180000000000',
+    1 => '24001800ffffffff',
+  ),
+  35 => 
+  array (
+    0 => '2400330000000000',
+    1 => '24003300ffffffff',
+  ),
+  36 => 
+  array (
+    0 => '2400478000000000',
+    1 => '24004780ffffffff',
+  ),
+  37 => 
+  array (
+    0 => '2400498000000000',
+    1 => '24004980ffffffff',
+  ),
+  38 => 
+  array (
+    0 => '24009f8000000000',
+    1 => '24009f80ffffffff',
+  ),
+  39 => 
+  array (
+    0 => '2400a58000000000',
+    1 => '2400a580ffffffff',
+  ),
+  40 => 
+  array (
+    0 => '2400ab0000000000',
+    1 => '2400ab00ffffffff',
+  ),
+  41 => 
+  array (
+    0 => '2400cf0000000000',
+    1 => '2400cf00ffffffff',
+  ),
+  42 => 
+  array (
+    0 => '2400fd8000000000',
+    1 => '2400fd80ffffffff',
+  ),
+  43 => 
+  array (
+    0 => '2401270000000000',
+    1 => '24012700ffffffff',
+  ),
+  44 => 
+  array (
+    0 => '2401400000000000',
+    1 => '24014000ffffffff',
+  ),
+  45 => 
+  array (
+    0 => '2401a00000000000',
+    1 => '2401a000ffffffff',
+  ),
+  46 => 
+  array (
+    0 => '2401a80000000000',
+    1 => '2401a800ffffffff',
+  ),
+  47 => 
+  array (
+    0 => '2401c50000000000',
+    1 => '2401c500ffffffff',
+  ),
+  48 => 
+  array (
+    0 => '2402000000000000',
+    1 => '240200ffffffffff',
+  ),
+  49 => 
+  array (
+    0 => '24021a0000000000',
+    1 => '24021a00ffffffff',
+  ),
+  50 => 
+  array (
+    0 => '2402310000000000',
+    1 => '24023100ffffffff',
+  ),
+  51 => 
+  array (
+    0 => '2402580000000000',
+    1 => '24025800ffffffff',
+  ),
+  52 => 
+  array (
+    0 => '2402610000000000',
+    1 => '24026100ffffffff',
+  ),
+  53 => 
+  array (
+    0 => '2402700000000000',
+    1 => '24027000ffffffff',
+  ),
+  54 => 
+  array (
+    0 => '2402be0000000000',
+    1 => '2402be00ffffffff',
+  ),
+  55 => 
+  array (
+    0 => '2402de0000000000',
+    1 => '2402de00ffffffff',
+  ),
+  56 => 
+  array (
+    0 => '2402f40000000000',
+    1 => '2402f400ffffffff',
+  ),
+  57 => 
+  array (
+    0 => '2403370000000000',
+    1 => '24033700ffffffff',
+  ),
+  58 => 
+  array (
+    0 => '2403630000000000',
+    1 => '24036300ffffffff',
+  ),
+  59 => 
+  array (
+    0 => '2403650000000000',
+    1 => '24036500ffffffff',
+  ),
+  60 => 
+  array (
+    0 => '2404000000000000',
+    1 => '2404000fffffffff',
+  ),
+  61 => 
+  array (
+    0 => '2404080000000000',
+    1 => '24040800ffffffff',
+  ),
+  62 => 
+  array (
+    0 => '2404230000000000',
+    1 => '24042300ffffffff',
+  ),
+  63 => 
+  array (
+    0 => '2404460000000000',
+    1 => '24044600ffffffff',
+  ),
+  64 => 
+  array (
+    0 => '2405350000000000',
+    1 => '24053500ffffffff',
+  ),
+  65 => 
+  array (
+    0 => '2405430000000000',
+    1 => '24054300ffffffff',
+  ),
+  66 => 
+  array (
+    0 => '2405580000000000',
+    1 => '24055800ffffffff',
+  ),
+  67 => 
+  array (
+    0 => '20010e6000000000',
+    1 => '20010e60ffffffff',
+  ),
+  68 => 
+  array (
+    0 => '20010e7000000000',
+    1 => '20010e70ffffffff',
+  ),
+  69 => 
+  array (
+    0 => '20010e7800000000',
+    1 => '20010e78ffffffff',
+  ),
+  70 => 
+  array (
+    0 => '20010e9800000000',
+    1 => '20010e98ffffffff',
+  ),
+  71 => 
+  array (
+    0 => '24009e8000000000',
+    1 => '24009e80ffffffff',
+  ),
+  72 => 
+  array (
+    0 => '2400e18000000000',
+    1 => '2400e180ffffffff',
+  ),
+  73 => 
+  array (
+    0 => '2401e20000000000',
+    1 => '2401e200ffffffff',
+  ),
+  74 => 
+  array (
+    0 => '24053d0000000000',
+    1 => '24053d00ffffffff',
+  ),
+  75 => 
+  array (
+    0 => '24055f0000000000',
+    1 => '24055f00ffffffff',
+  ),
+  76 => 
+  array (
+    0 => '24057b0000000000',
+    1 => '24057b00ffffffff',
+  ),
+  77 => 
+  array (
+    0 => '2405860000000000',
+    1 => '24058600ffffffff',
+  ),
+  78 => 
+  array (
+    0 => '2405950000000000',
+    1 => '24059500ffffffff',
+  ),
+  79 => 
+  array (
+    0 => '2405c00000000000',
+    1 => '2405c000ffffffff',
+  ),
+  80 => 
+  array (
+    0 => '2406400000000000',
+    1 => '24064000ffffffff',
+  ),
+  81 => 
+  array (
+    0 => '2406590000000000',
+    1 => '24065900ffffffff',
+  ),
+  82 => 
+  array (
+    0 => '2406660000000000',
+    1 => '24066600ffffffff',
+  ),
+  83 => 
+  array (
+    0 => '2406680000000000',
+    1 => '24066800ffffffff',
+  ),
+  84 => 
+  array (
+    0 => '24066a0000000000',
+    1 => '24066a00ffffffff',
+  ),
+  85 => 
+  array (
+    0 => '2406ad0000000000',
+    1 => '2406ad00ffffffff',
+  ),
+  86 => 
+  array (
+    0 => '2406b00000000000',
+    1 => '2406b000ffffffff',
+  ),
+  87 => 
+  array (
+    0 => '2406d00000000000',
+    1 => '2406d000ffffffff',
+  ),
+  88 => 
+  array (
+    0 => '2406d70000000000',
+    1 => '2406d700ffffffff',
+  ),
+  89 => 
+  array (
+    0 => '24070b0000000000',
+    1 => '24070b00ffffffff',
+  ),
+  90 => 
+  array (
+    0 => '2407200000000000',
+    1 => '24072000ffffffff',
+  ),
+  91 => 
+  array (
+    0 => '2407350000000000',
+    1 => '24073500ffffffff',
+  ),
+  92 => 
+  array (
+    0 => '2407650000000000',
+    1 => '24076500ffffffff',
+  ),
+  93 => 
+  array (
+    0 => '2407670000000000',
+    1 => '24076700ffffffff',
+  ),
+  94 => 
+  array (
+    0 => '2407910000000000',
+    1 => '24079100ffffffff',
+  ),
+  95 => 
+  array (
+    0 => '2407b20000000000',
+    1 => '2407b200ffffffff',
+  ),
+  96 => 
+  array (
+    0 => '2407b80000000000',
+    1 => '2407b800ffffffff',
+  ),
+  97 => 
+  array (
+    0 => '2407c00000000000',
+    1 => '2407c000ffffffff',
+  ),
+  98 => 
+  array (
+    0 => '2407c70000000000',
+    1 => '2407c700ffffffff',
+  ),
+);
diff --git a/common/framework/korea.php b/common/framework/korea.php
new file mode 100644
index 000000000..67f02e7e4
--- /dev/null
+++ b/common/framework/korea.php
@@ -0,0 +1,453 @@
+<?php
+
+namespace Rhymix\Framework;
+
+/**
+ * Class for validating Korea-specific information.
+ */
+class Korea
+{
+	/**
+	 * Format a phone number.
+	 * 
+	 * @param string $num
+	 * @return string
+	 */
+	public static function formatPhoneNumber($num)
+	{
+		// Remove all non-numbers.
+		$num = preg_replace('/[^0-9]/', '', $num);
+		
+		// Remove the country code.
+		if (strncmp($num, '82', 2) === 0)
+		{
+			$num = substr($num, 2);
+			if (strncmp($num, '0', 1) !== 0)
+			{
+				$num = '0' . $num;
+			}
+		}
+		
+		// Apply different format based on the number of digits.
+		switch (strlen($num))
+		{
+			case 8:
+				return substr($num, 0, 4) . '-' . substr($num, 4);
+			case 9:
+				return substr($num, 0, 2) . '-' . substr($num, 2, 3) . '-' . substr($num, 5);
+			case 10:
+				if (substr($num, 0, 2) === '02')
+				{
+					return substr($num, 0, 2) . '-' . substr($num, 2, 4) . '-' . substr($num, 6);
+				}
+				else
+				{
+					return substr($num, 0, 3) . '-' . substr($num, 3, 3) . '-' . substr($num, 6);
+				}
+			default:
+				if (substr($num, 0, 4) === '0303' || substr($num, 0, 3) === '050')
+				{
+					return substr($num, 0, 4) . '-' . substr($num, 4, 3) . '-' . substr($num, 7);
+				}
+				else
+				{
+					return substr($num, 0, 3) . '-' . substr($num, 3, 4) . '-' . substr($num, 7);
+				}
+		}
+	}
+	
+	/**
+	 * Check if a Korean phone number contains a valid area code and the correct number of digits.
+	 * 
+	 * @param string $num
+	 * @return bool
+	 */
+	public static function isValidPhoneNumber($num)
+	{
+		$num = str_replace('-', '', self::formatPhoneNumber($num));
+		if (preg_match('/^1[0-9]{7}$/', $num))
+		{
+			return true;
+		}
+		if (preg_match('/^02[2-9][0-9]{6,7}$/', $num))
+		{
+			return true;
+		}
+		if (preg_match('/^0[13-8][0-9][2-9][0-9]{6,7}$/', $num))
+		{
+			return true;
+		}
+		return false;
+	}
+	
+	/**
+	 * Check if a Korean phone number is a mobile phone number.
+	 * 
+	 * @param string $num
+	 * @return bool
+	 */
+	public static function isValidMobilePhoneNumber($num)
+	{
+		$num = str_replace('-', '', self::formatPhoneNumber($num));
+		$len = strlen($num);
+		return preg_match('/^01[016789][2-9][0-9]{6,7}$/', $num) ? true : false;
+	}
+	
+	/**
+	 * Check if the given string is a valid resident registration number (주민등록번호)
+	 * or foreigner registration number (외국인등록번호).
+	 * 
+	 * This method only checks the format.
+	 * It does not check that the number is actually in use.
+	 * 
+	 * @param string $code
+	 * @return bool
+	 */
+	public static function isValidJuminNumber($code)
+	{
+		// Return false if the format is obviously wrong.
+		if (!preg_match('/^[0-9]{6}-?[0-9]{7}$/', $code))
+		{
+			return false;
+		}
+		
+		// Remove hyphen.
+		$code = str_replace('-', '', $code);
+		
+		// Return false if the date of birth is in the future.
+		if (in_array((int)($code[6]), array(3, 4, 7, 8)) && intval(substr($code, 0, 6), 10) > date('ymd'))
+		{
+			return false;
+		}
+		
+		// Calculate the checksum.
+		$sum = 0;
+		for ($i = 0; $i < 12; $i++)
+		{
+			$sum += $code[$i] * (($i % 8) + 2);
+		}
+		$checksum = (11 - ($sum % 11)) % 10;
+		if (in_array((int)($code[6]), array(1, 2, 3, 4, 9, 0)))
+		{
+			return $checksum === (int)($code[12]);
+		}
+		else
+		{
+			if (substr($code, 7, 2) % 2 !== 0)
+			{
+				return false;
+			}
+			else
+			{
+				return (($checksum + 2) % 10) === (int)($code[12]);
+			}
+		}
+	}
+	
+	/**
+	 * Check if the given string is a valid corporation registration number (법인등록번호).
+	 * 
+	 * This method only checks the format.
+	 * It does not check that the number is actually in use.
+	 * 
+	 * @param string $code
+	 * @return bool
+	 */
+	public static function isValidCorporationNumber($code)
+	{
+		// Return false if the format is obviously wrong.
+		if (!preg_match('/^[0-9]{6}-?[0-9]{7}$/', $code))
+		{
+			return false;
+		}
+		
+		// Remove hyphen.
+		$code = str_replace('-', '', $code);
+		
+		// Calculate the checksum.
+		$sum = 0;
+		for ($i = 0; $i < 12; $i++)
+		{
+			$sum += $code[$i] * (($i % 2) + 1);
+		}
+		$checksum = (10 - ($sum % 10)) % 10;
+		
+		// Check the 7th and 13th digits.
+		if ($code[6] !== '0')
+		{
+			return false;
+		}
+		return $checksum === (int)($code[12]);
+	}
+	
+	/**
+	 * Check if the given string is a valid business registration number (사업자등록번호).
+	 * 
+	 * This method only checks the format.
+	 * It does not check that the number is actually in use.
+	 * 
+	 * @param string $code
+	 * @return bool
+	 */
+	public static function isValidBusinessNumber($code)
+	{
+		// Return false if the format is obviously wrong.
+		if (!preg_match('/^[0-9]{3}-?[0-9]{2}-?[0-9]{5}$/', $code))
+		{
+			return false;
+		}
+		
+		// Remove hyphen.
+		$code = str_replace('-', '', $code);
+		
+		// Calculate the checksum.
+		$sum = 0;
+		$sum += $code[0] + ($code[1] * 3) + ($code[2] * 7);
+		$sum += $code[3] + ($code[4] * 3) + ($code[5] * 7);
+		$sum += $code[6] + ($code[7] * 3) + ($code[8] * 5);
+		$sum += floor(($code[8] * 5) / 10);
+		$checksum = (10 - ($sum % 10)) % 10;
+		
+		// Check the last digit.
+		return $checksum === (int)($code[9]);
+	}
+	
+	/**
+	 * Check if the given IP address is Korean.
+	 *
+	 * This method may return incorrect results if the IP allocation databases
+	 * (korea.ipv4.php, korea.ipv6.php) are out of date.
+	 * 
+	 * @param string $ip
+	 * @return bool
+	 */
+	public static function isKoreanIP($ip)
+	{
+		// Extract the IPv4 address from an "IPv4-mapped IPv6" address.
+		if (preg_match('/::ffff:(?:0+:)?([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)$/', $ip, $matches)) $ip = $matches[1];
+		
+		// Return false if the IP address is not in the right format.
+		if (!filter_var($ip, \FILTER_VALIDATE_IP)) return false;
+		
+		// Check IPv4.
+		if (filter_var($ip, \FILTER_VALIDATE_IP, ['flags' => \FILTER_FLAG_IPV4]))
+		{
+			// Convert to integer.
+			$ipnum = sprintf('%u', ip2long($ip));
+			
+			// Treat local addresses as Korean.
+			if ($ipnum >= 167772160 && $ipnum <= 184549375) return true;    // 10.0.0.0/8
+			if ($ipnum >= 2130706432 && $ipnum <= 2147483647) return true;  // 127.0.0.0/8
+			if ($ipnum >= 3232235520 && $ipnum <= 3232301055) return true;  // 192.168.0.0/16
+			if ($ipnum >= 2886729728 && $ipnum <= 2887778303) return true;  // 172.16.0.0/20
+			
+			// Check the IPv4 allocation database.
+			$ranges = (include \RX_BASEDIR . 'common/defaults/korea.ipv4.php');
+			foreach ($ranges as $range)
+			{
+				if ($ipnum >= $range[0] && $ipnum <= $range[1]) return true;
+			}
+			return false;
+		}
+		
+		// Check IPv6.
+		elseif (function_exists('inet_pton'))
+		{
+			// Convert to hexadecimal format.
+			$ipbin = strtolower(bin2hex(inet_pton($ip)));
+			
+			// Treat local addresses as Korean.
+			if ($ipbin == '00000000000000000000000000000001') return true;  // ::1
+			if (preg_match('/^f(?:[cd]|e80{13})/', $ipbin)) return true;    // fc00::/8, fd00::/8, fe80::/64
+			
+			// Check the IPv6 allocation database.
+			$ranges = (include \RX_BASEDIR . 'common/defaults/korea.ipv6.php');
+			foreach ($ranges as $range)
+			{
+				if (strncmp($ipbin, $range[0], 16) >= 0 && strncmp($ipbin, $range[1], 16) <= 0) return true;
+			}
+			return false;
+		}
+		
+		return false;
+	}
+	
+	/**
+	 * Check if the given email address is hosted by a Korean portal site.
+	 * 
+	 * This can be used to tell which recipients may subscribe to the KISA RBL (kisarbl.or.kr).
+	 * If the domain is not found, this method returns false.
+	 * 
+	 * @param string $domain
+	 * @param bool $clear_cache (optional)
+	 * @return bool
+	 */
+	public static function isKoreanEmailAddress($email_address, $clear_cache = false)
+	{
+		// Clear the cache if requested.
+		if ($clear_cache)
+		{
+			self::$_domain_cache = array();
+		}
+		
+		// Get the domain from the email address.
+		if ($pos = strpos($email_address, '@'))
+		{
+			$domain = substr($email_address, $pos + 1);
+		}
+		else
+		{
+			$domain = $email_address;
+		}
+		$domain = rtrim(strtolower($domain), '.');
+		
+		// Return cached result if available.
+		if (array_key_exists($domain, self::$_domain_cache))
+		{
+			return self::$_domain_cache[$domain];
+		}
+		
+		// Shortcut for known domains.
+		if (in_array($domain, self::$known_korean))
+		{
+			return self::$_domain_cache[$domain] = true;
+		}
+		if (in_array($domain, self::$known_foreign))
+		{
+			return self::$_domain_cache[$domain] = false;
+		}
+		
+		// For unknown domains, check the MX record.
+		$mx = self::_getDNSRecords($domain, \DNS_MX);
+		
+		$i = 0;
+		foreach ($mx as $mx)
+		{
+			$mx = rtrim($mx, '.');
+			foreach (self::$known_korean as $portal)
+			{
+				if ($mx === $portal || ends_with('.' . $portal, $mx))
+				{
+					return self::$_domain_cache[$domain] = true;
+				}
+			}
+			foreach (self::$known_foreign as $portal)
+			{
+				if ($mx === $portal || ends_with('.' . $portal, $mx))
+				{
+					return self::$_domain_cache[$domain] = false;
+				}
+			}
+			foreach (self::_getDNSRecords($domain, \DNS_A) as $mx_ip)
+			{
+				return self::$_domain_cache[$domain] = self::isKoreanIP($mx_ip);
+			}
+			if (++$i > 2)
+			{
+				break;
+			}
+		}
+		
+		return self::$_domain_cache[$domain] = false;
+	}
+	
+	/**
+	 * Get the DNS records of a domain.
+	 * 
+	 * @param string $domain
+	 * @param int $type
+	 * @return array
+	 */
+	protected static function _getDNSRecords($domain, $type)
+	{
+		$records = dns_get_record($domain, $type);
+		if (!$records)
+		{
+			return array();
+		}
+		
+		$result = array();
+		foreach ($records as $record)
+		{
+			if (isset($record['pri']) && isset($record['target']))
+			{
+				$result[intval($record['pri'])] = $record['target'];
+			}
+			elseif (isset($record['target']))
+			{
+				$result[] = $record['target'];
+			}
+			elseif (isset($record['ip']) || isset($record['ipv6']))
+			{
+				$result[] = isset($record['ip']) ? $record['ip'] : $record['ipv6'];
+			}
+			elseif (isset($record['txt']))
+			{
+				$result[] = $record['txt'];
+			}
+		}
+		
+		ksort($result);
+		return $result;
+	}
+	
+	/**
+	 * Prevent multiple lookups for the same domain.
+	 */
+	protected static $_domain_cache = array();
+	
+	/**
+	 * Domains known to be Korean and subscribed to the KISA RBL.
+	 */
+	public static $known_korean = array(
+		'hanmail.net',
+		'hanmail2.net',
+		'daum.net',
+		'paran.com',
+		'tistory.com',
+		'naver.com',
+		'navercorp.com',
+		'nate.com',
+		'cyworld.com',
+		'dreamwiz.com',
+		'korea.com',
+		'dreamx.com',
+		'chol.com',
+		'chollian.net',
+		'hanmir.com',
+		'hitel.com',
+		'freechal.com',
+		'empas.com',
+		'empal.com',
+		'hanafos.com',
+	);
+	
+	/**
+	 * Domains known to be foreign.
+	 */
+	public static $known_foreign = array(
+		'gmail.com',
+		'googlemail.com',
+		'google.com',
+		'yahoo.com',
+		'yahoo.co.kr',
+		'hotmail.com',
+		'hotmail.co.kr',
+		'live.com',
+		'outlook.com',
+		'msn.com',
+		'me.com',
+		'mac.com',
+		'icloud.com',
+		'facebook.com',
+		'aol.com',
+		'gmx.com',
+		'mail.com',
+		'fastmail.com',
+		'fastmail.fm',
+		'runbox.com',
+		'inbox.com',
+		'lycos.com',
+		'zoho.com',
+	);
+}
diff --git a/tests/unit/framework/KoreaTest.php b/tests/unit/framework/KoreaTest.php
new file mode 100644
index 000000000..958af741b
--- /dev/null
+++ b/tests/unit/framework/KoreaTest.php
@@ -0,0 +1,107 @@
+<?php
+
+class KoreaTest extends \Codeception\TestCase\Test
+{
+	public function testFormatPhoneNumber()
+	{
+		$this->assertEquals('1588-0000', Rhymix\Framework\Korea::formatPhoneNumber('1588-0000'));
+		$this->assertEquals('02-345-6789', Rhymix\Framework\Korea::formatPhoneNumber('+82 23456789'));
+		$this->assertEquals('02-3000-5000', Rhymix\Framework\Korea::formatPhoneNumber('0230005000'));
+		$this->assertEquals('031-222-3333', Rhymix\Framework\Korea::formatPhoneNumber('82-0312-2233-33'));
+		$this->assertEquals('031-2222-3333', Rhymix\Framework\Korea::formatPhoneNumber('03122223333'));
+		$this->assertEquals('011-444-5555', Rhymix\Framework\Korea::formatPhoneNumber('011 444 5555'));
+		$this->assertEquals('010-6666-7777', Rhymix\Framework\Korea::formatPhoneNumber('82+1066667777'));
+		$this->assertEquals('0303-456-7890', Rhymix\Framework\Korea::formatPhoneNumber('03034567890'));
+		$this->assertEquals('0505-987-6543', Rhymix\Framework\Korea::formatPhoneNumber('050-5987-6543'));
+		$this->assertEquals('070-7432-1000', Rhymix\Framework\Korea::formatPhoneNumber('0707-432-1000'));
+	}
+	
+	public function testIsValidPhoneNumber()
+	{
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('1588-0000'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('02-345-6789'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('+82-2-345-6789'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('+82-02-2345-6789'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('053-444-5555'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('053-4444-5555'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('011-444-5555'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidPhoneNumber('010-4444-5555'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidPhoneNumber('010-4444-55555'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidPhoneNumber('010-1234-5678'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidPhoneNumber('02-123-4567'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidPhoneNumber('02-123456'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidPhoneNumber('03-456-7890'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidPhoneNumber('090-9876-5432'));
+	}
+	
+	public function testIsValidMobilePhoneNumber()
+	{
+		$this->assertTrue(Rhymix\Framework\Korea::isValidMobilePhoneNumber('011-345-6789'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidMobilePhoneNumber('010-2345-6789'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidMobilePhoneNumber('+82-11-345-6789'));
+		$this->assertTrue(Rhymix\Framework\Korea::isValidMobilePhoneNumber('82 010-2345-6789'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidMobilePhoneNumber('010-1111-1111'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidMobilePhoneNumber('02-345-6789'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidMobilePhoneNumber('063-9876-5432'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidMobilePhoneNumber('070-7654-3210'));
+	}
+	
+	public function testIsValidJuminNumber()
+	{
+		// These numbers are fake.
+		$this->assertTrue(Rhymix\Framework\Korea::isValidJuminNumber('123456-3456787'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidJuminNumber('123456-3456788'));
+	}
+	
+	public function testIsValidCorporationNumber()
+	{
+		// These numbers are fake.
+		$this->assertTrue(Rhymix\Framework\Korea::isValidCorporationNumber('123456-0123453'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidCorporationNumber('123456-0123454'));
+	}
+	
+	public function testIsValidBusinessNumber()
+	{
+		// These numbers are fake.
+		$this->assertTrue(Rhymix\Framework\Korea::isValidBusinessNumber('123-45-67891'));
+		$this->assertFalse(Rhymix\Framework\Korea::isValidBusinessNumber('123-45-67892'));
+	}
+	
+	public function testIsKoreanIP()
+	{
+		// Private IP ranges.
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('10.12.34.210'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('127.0.123.45'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('192.168.10.1'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('::1'));
+		
+		// Korean IP ranges.
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('115.71.233.0'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('114.207.12.3'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('2001:0320::1'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanIP('2407:B800::F'));
+		
+		// Foreign IP ranges.
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanIP('216.58.197.0'));
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanIP('170.14.168.0'));
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanIP('2001:41d0:8:e8ad::1'));
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanIP('2404:6800:4005:802::200e'));
+	}
+	
+	public function testIsKoreanEmailAddress()
+	{
+		// Test Korean portals.
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanEmailAddress('test@naver.com'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanEmailAddress('test@hanmail.net'));
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanEmailAddress('test@worksmobile.com'));
+		
+		// Test foreign portals.
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanEmailAddress('test@gmail.com'));
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanEmailAddress('test@hotmail.com'));
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanEmailAddress('test@yahoo.com'));
+		
+		// Test third-party MX services.
+		$this->assertTrue(Rhymix\Framework\Korea::isKoreanEmailAddress('test@woorimail.com'));
+		$this->assertFalse(Rhymix\Framework\Korea::isKoreanEmailAddress('test@rhymix.org'));
+	}
+}
diff --git a/tools/korea_ip_ranges/korea.ipv4.parser.php b/tools/korea_ip_ranges/korea.ipv4.parser.php
new file mode 100644
index 000000000..26fba1ce3
--- /dev/null
+++ b/tools/korea_ip_ranges/korea.ipv4.parser.php
@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * Do not allow execution over the web.
+ */
+if (PHP_SAPI !== 'cli')
+{
+    exit 1;
+}
+
+/**
+ * Download the latest IPv4 data from libkrisp.
+ */
+$download_url = 'https://mirror.oops.org/pub/oops/libkrisp/data/v2/krisp.csv.gz';
+$referer_url = 'https://mirror.oops.org/pub/oops/libkrisp/data/v2/';
+$content = file_get_contents($download_url, false, stream_context_create(array(
+    'http' => array(
+        'user_agent' => 'Mozilla/5.0 (compatible; IP range generator)',
+        'header' => 'Referer: ' . $referer_url . "\r\n",
+    ),
+)));
+$content = gzdecode($content);
+if (!$content)
+{
+    exit 2;
+}
+
+/**
+ * Load IP range data.
+ */
+$ranges = array();
+$content = explode("\n", $content);
+foreach ($content as $line)
+{
+    $line = explode("\t", $line);
+    if (count($line) < 2) continue;
+    $start = trim($line[0]);
+    $end = trim($line[1]);
+    $ranges[$start] = array($start, $end);
+}
+
+/**
+ * Sort the ranges.
+ */
+ksort($ranges);
+$ranges = array_values($ranges);
+$count = count($ranges);
+
+/**
+ * Merge adjacent ranges.
+ */
+for ($i = 0; $i < $count; $i++)
+{
+    if ($i == 0) continue;
+    $previous_i = $i - 1;
+    while (true)
+    {
+        if ($ranges[$previous_i] !== null) break;
+        $previous_i--;
+    }
+    
+    if ($ranges[$i][0] == $ranges[$previous_i][1] + 1)
+    {
+        $ranges[$previous_i][1] = $ranges[$i][1];
+        $ranges[$i] = null;
+    }
+}
+
+/**
+ * Organize into final format.
+ */
+$ranges_final = array();
+foreach ($ranges as $range)
+{
+    if ($range !== null) $ranges_final[] = $range;
+}
+
+/**
+ * Save to file.
+ */
+$content = '<' . '?php' . "\n\n" . '/**' . "\n" . ' * Source: ' . $referer_url . "\n";
+$content .= ' * Last Updated: ' . date('Y-m-d') . "\n" . ' */' . "\n";
+$content .= 'return ' . var_export($ranges_final, true) . ';' . "\n";
+file_put_contents('korea.ipv4.php', $content);
+
+/**
+ * Report status.
+ */
+echo count($ranges_final) . ' IPv4 ranges saved.' . PHP_EOL;
diff --git a/tools/korea_ip_ranges/korea.ipv6.parser.php b/tools/korea_ip_ranges/korea.ipv6.parser.php
new file mode 100644
index 000000000..a4052e7e9
--- /dev/null
+++ b/tools/korea_ip_ranges/korea.ipv6.parser.php
@@ -0,0 +1,92 @@
+<?php
+
+/**
+ * Do not allow execution over the web.
+ */
+if (PHP_SAPI !== 'cli')
+{
+    exit 1;
+}
+
+/**
+ * Download the latest IPv6 data from KISA.
+ */
+$download_url = 'https://ip.kisa.or.kr/ip_cate_stat/stat_05_05_toexcel.act';
+$referer_url = 'https://ip.kisa.or.kr/ip_cate_stat/stat_05_05.act';
+$content = file_get_contents($download_url, false, stream_context_create(array(
+    'http' => array(
+        'user_agent' => 'Mozilla/5.0 (compatible; IP range generator)',
+        'header' => 'Referer: ' . $referer_url . "\r\n",
+    ),
+)));
+if (!$content)
+{
+    exit 2;
+}
+
+/**
+ * Parse the HTML/Excel document.
+ */
+$regex = '#<tr>\\s*<td [^>]+>([0-9a-f:]+::)</td>\\s*<td [^>]+>(/[0-9]+)</td>#iU';
+preg_match_all($regex, $content, $matches, PREG_SET_ORDER);
+
+/**
+ * Extract the address and netmask for each range.
+ */
+$ranges = array();
+foreach ($matches as $match)
+{
+    $start = str_pad(str_replace(':', '', strtolower($match[1])), 16, '0', STR_PAD_RIGHT);
+    $mask = str_repeat('f', ((64 - trim($match[2], '/')) / 4));
+    $end = substr($start, 0, 16 - strlen($mask)) . $mask;
+    $ranges[$start] = array($start, $end);
+}
+
+/**
+ * Sort the ranges.
+ */
+ksort($ranges);
+$ranges = array_values($ranges);
+$count = count($ranges);
+
+/**
+ * Merge adjacent ranges.
+ */
+for ($i = 0; $i < $count; $i++)
+{
+    if ($i == 0) continue;
+    $previous_i = $i - 1;
+    while (true)
+    {
+        if ($ranges[$previous_i] !== null) break;
+        $previous_i--;
+    }
+    
+    if (hexdec($ranges[$i][0]) == hexdec($ranges[$previous_i][1]) + 1)
+    {
+        $ranges[$previous_i][1] = $ranges[$i][1];
+        $ranges[$i] = null;
+    }
+}
+
+/**
+ * Organize into final format.
+ */
+$ranges_final = array();
+foreach ($ranges as $range)
+{
+    if ($range !== null) $ranges_final[] = $range;
+}
+
+/**
+ * Save to file.
+ */
+$content = '<' . '?php' . "\n\n" . '/**' . "\n" . ' * Source: ' . $referer_url . "\n";
+$content .= ' * Last Updated: ' . date('Y-m-d') . "\n" . ' */' . "\n";
+$content .= 'return ' . var_export($ranges_final, true) . ';' . "\n";
+file_put_contents('korea.ipv6.php', $content);
+
+/**
+ * Report status.
+ */
+echo count($ranges_final) . ' IPv6 ranges saved.' . PHP_EOL;