--- toc_priority: 55 toc_title: IP Addresses --- # Functions for Working with IPv4 and IPv6 Addresses {#functions-for-working-with-ip-addresses} ## IPv4NumToString(num) {#ipv4numtostringnum} Takes a UInt32 number. Interprets it as an IPv4 address in big endian. Returns a string containing the corresponding IPv4 address in the format A.B.C.d (dot-separated numbers in decimal form). ## IPv4StringToNum(s) {#ipv4stringtonums} The reverse function of IPv4NumToString. If the IPv4 address has an invalid format, it returns 0. ## IPv4NumToStringClassC(num) {#ipv4numtostringclasscnum} Similar to IPv4NumToString, but using xxx instead of the last octet. Example: ``` sql SELECT IPv4NumToStringClassC(ClientIP) AS k, count() AS c FROM test.hits GROUP BY k ORDER BY c DESC LIMIT 10 ``` ``` text ┌─k──────────────┬─────c─┐ │ 83.149.9.xxx │ 26238 │ │ 217.118.81.xxx │ 26074 │ │ 213.87.129.xxx │ 25481 │ │ 83.149.8.xxx │ 24984 │ │ 217.118.83.xxx │ 22797 │ │ 78.25.120.xxx │ 22354 │ │ 213.87.131.xxx │ 21285 │ │ 78.25.121.xxx │ 20887 │ │ 188.162.65.xxx │ 19694 │ │ 83.149.48.xxx │ 17406 │ └────────────────┴───────┘ ``` Since using ‘xxx’ is highly unusual, this may be changed in the future. We recommend that you don’t rely on the exact format of this fragment. ### IPv6NumToString(x) {#ipv6numtostringx} Accepts a FixedString(16) value containing the IPv6 address in binary format. Returns a string containing this address in text format. IPv6-mapped IPv4 addresses are output in the format ::ffff:111.222.33.44. Examples: ``` sql SELECT IPv6NumToString(toFixedString(unhex('2A0206B8000000000000000000000011'), 16)) AS addr ``` ``` text ┌─addr─────────┐ │ 2a02:6b8::11 │ └──────────────┘ ``` ``` sql SELECT IPv6NumToString(ClientIP6 AS k), count() AS c FROM hits_all WHERE EventDate = today() AND substring(ClientIP6, 1, 12) != unhex('00000000000000000000FFFF') GROUP BY k ORDER BY c DESC LIMIT 10 ``` ``` text ┌─IPv6NumToString(ClientIP6)──────────────┬─────c─┐ │ 2a02:2168:aaa:bbbb::2 │ 24695 │ │ 2a02:2698:abcd:abcd:abcd:abcd:8888:5555 │ 22408 │ │ 2a02:6b8:0:fff::ff │ 16389 │ │ 2a01:4f8:111:6666::2 │ 16016 │ │ 2a02:2168:888:222::1 │ 15896 │ │ 2a01:7e00::ffff:ffff:ffff:222 │ 14774 │ │ 2a02:8109:eee:ee:eeee:eeee:eeee:eeee │ 14443 │ │ 2a02:810b:8888:888:8888:8888:8888:8888 │ 14345 │ │ 2a02:6b8:0:444:4444:4444:4444:4444 │ 14279 │ │ 2a01:7e00::ffff:ffff:ffff:ffff │ 13880 │ └─────────────────────────────────────────┴───────┘ ``` ``` sql SELECT IPv6NumToString(ClientIP6 AS k), count() AS c FROM hits_all WHERE EventDate = today() GROUP BY k ORDER BY c DESC LIMIT 10 ``` ``` text ┌─IPv6NumToString(ClientIP6)─┬──────c─┐ │ ::ffff:94.26.111.111 │ 747440 │ │ ::ffff:37.143.222.4 │ 529483 │ │ ::ffff:5.166.111.99 │ 317707 │ │ ::ffff:46.38.11.77 │ 263086 │ │ ::ffff:79.105.111.111 │ 186611 │ │ ::ffff:93.92.111.88 │ 176773 │ │ ::ffff:84.53.111.33 │ 158709 │ │ ::ffff:217.118.11.22 │ 154004 │ │ ::ffff:217.118.11.33 │ 148449 │ │ ::ffff:217.118.11.44 │ 148243 │ └────────────────────────────┴────────┘ ``` ## IPv6StringToNum(s) {#ipv6stringtonums} The reverse function of IPv6NumToString. If the IPv6 address has an invalid format, it returns a string of null bytes. If the IP address is a valid IPv4 address then the IPv6 equivalent of the IPv4 address is returned. HEX can be uppercase or lowercase. ``` sql SELECT cutIPv6(IPv6StringToNum('127.0.0.1'), 0, 0); ``` ``` text ┌─cutIPv6(IPv6StringToNum('127.0.0.1'), 0, 0)─┐ │ ::ffff:127.0.0.1 │ └─────────────────────────────────────────────┘ ``` ## IPv4ToIPv6(x) {#ipv4toipv6x} Takes a `UInt32` number. Interprets it as an IPv4 address in [big endian](https://en.wikipedia.org/wiki/Endianness). Returns a `FixedString(16)` value containing the IPv6 address in binary format. Examples: ``` sql SELECT IPv6NumToString(IPv4ToIPv6(IPv4StringToNum('192.168.0.1'))) AS addr ``` ``` text ┌─addr───────────────┐ │ ::ffff:192.168.0.1 │ └────────────────────┘ ``` ## cutIPv6(x, bytesToCutForIPv6, bytesToCutForIPv4) {#cutipv6x-bytestocutforipv6-bytestocutforipv4} Accepts a FixedString(16) value containing the IPv6 address in binary format. Returns a string containing the address of the specified number of bytes removed in text format. For example: ``` sql WITH IPv6StringToNum('2001:0DB8:AC10:FE01:FEED:BABE:CAFE:F00D') AS ipv6, IPv4ToIPv6(IPv4StringToNum('192.168.0.1')) AS ipv4 SELECT cutIPv6(ipv6, 2, 0), cutIPv6(ipv4, 0, 2) ``` ``` text ┌─cutIPv6(ipv6, 2, 0)─────────────────┬─cutIPv6(ipv4, 0, 2)─┐ │ 2001:db8:ac10:fe01:feed:babe:cafe:0 │ ::ffff:192.168.0.0 │ └─────────────────────────────────────┴─────────────────────┘ ``` ## IPv4CIDRToRange(ipv4, Cidr), {#ipv4cidrtorangeipv4-cidr} Accepts an IPv4 and an UInt8 value containing the [CIDR](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing). Return a tuple with two IPv4 containing the lower range and the higher range of the subnet. ``` sql SELECT IPv4CIDRToRange(toIPv4('192.168.5.2'), 16) ``` ``` text ┌─IPv4CIDRToRange(toIPv4('192.168.5.2'), 16)─┐ │ ('192.168.0.0','192.168.255.255') │ └────────────────────────────────────────────┘ ``` ## IPv6CIDRToRange(ipv6, Cidr), {#ipv6cidrtorangeipv6-cidr} Accepts an IPv6 and an UInt8 value containing the CIDR. Return a tuple with two IPv6 containing the lower range and the higher range of the subnet. ``` sql SELECT IPv6CIDRToRange(toIPv6('2001:0db8:0000:85a3:0000:0000:ac1f:8001'), 32); ``` ``` text ┌─IPv6CIDRToRange(toIPv6('2001:0db8:0000:85a3:0000:0000:ac1f:8001'), 32)─┐ │ ('2001:db8::','2001:db8:ffff:ffff:ffff:ffff:ffff:ffff') │ └────────────────────────────────────────────────────────────────────────┘ ``` ## toIPv4(string) {#toipv4string} An alias to `IPv4StringToNum()` that takes a string form of IPv4 address and returns value of [IPv4](../../sql-reference/data-types/domains/ipv4.md) type, which is binary equal to value returned by `IPv4StringToNum()`. ``` sql WITH '171.225.130.45' as IPv4_string SELECT toTypeName(IPv4StringToNum(IPv4_string)), toTypeName(toIPv4(IPv4_string)) ``` ``` text ┌─toTypeName(IPv4StringToNum(IPv4_string))─┬─toTypeName(toIPv4(IPv4_string))─┐ │ UInt32 │ IPv4 │ └──────────────────────────────────────────┴─────────────────────────────────┘ ``` ``` sql WITH '171.225.130.45' as IPv4_string SELECT hex(IPv4StringToNum(IPv4_string)), hex(toIPv4(IPv4_string)) ``` ``` text ┌─hex(IPv4StringToNum(IPv4_string))─┬─hex(toIPv4(IPv4_string))─┐ │ ABE1822D │ ABE1822D │ └───────────────────────────────────┴──────────────────────────┘ ``` ## toIPv6(string) {#toipv6string} An alias to `IPv6StringToNum()` that takes a string form of IPv6 address and returns value of [IPv6](../../sql-reference/data-types/domains/ipv6.md) type, which is binary equal to value returned by `IPv6StringToNum()`. If the IP address is a valid IPv4 address then the IPv6 equivalent of the IPv4 address is returned. ``` sql WITH '2001:438:ffff::407d:1bc1' as IPv6_string SELECT toTypeName(IPv6StringToNum(IPv6_string)), toTypeName(toIPv6(IPv6_string)) ``` ``` text ┌─toTypeName(IPv6StringToNum(IPv6_string))─┬─toTypeName(toIPv6(IPv6_string))─┐ │ FixedString(16) │ IPv6 │ └──────────────────────────────────────────┴─────────────────────────────────┘ ``` ``` sql WITH '2001:438:ffff::407d:1bc1' as IPv6_string SELECT hex(IPv6StringToNum(IPv6_string)), hex(toIPv6(IPv6_string)) ``` ``` text ┌─hex(IPv6StringToNum(IPv6_string))─┬─hex(toIPv6(IPv6_string))─────────┐ │ 20010438FFFF000000000000407D1BC1 │ 20010438FFFF000000000000407D1BC1 │ └───────────────────────────────────┴──────────────────────────────────┘ ``` ``` sql SELECT toIPv6('127.0.0.1') ``` ``` text ┌─toIPv6('127.0.0.1')─┐ │ ::ffff:127.0.0.1 │ └─────────────────────┘ ``` ## isIPv4String {#isipv4string} Determines whether the input string is an IPv4 address or not. If `string` is IPv6 address returns `0`. **Syntax** ```sql isIPv4String(string) ``` **Parameters** - `string` — IP address. [String](../../sql-reference/data-types/string.md). **Returned value** - `1` if `string` is IPv4 address, `0` otherwise. Type: [UInt8](../../sql-reference/data-types/int-uint.md). **Examples** Query: ```sql SELECT addr, isIPv4String(addr) FROM ( SELECT ['0.0.0.0', '127.0.0.1', '::ffff:127.0.0.1'] AS addr ) ARRAY JOIN addr ``` Result: ``` text ┌─addr─────────────┬─isIPv4String(addr)─┐ │ 0.0.0.0 │ 1 │ │ 127.0.0.1 │ 1 │ │ ::ffff:127.0.0.1 │ 0 │ └──────────────────┴────────────────────┘ ``` ## isIPv6String {#isipv6string} Determines whether the input string is an IPv6 address or not. If `string` is IPv4 address returns `0`. **Syntax** ```sql isIPv6String(string) ``` **Parameters** - `string` — IP address. [String](../../sql-reference/data-types/string.md). **Returned value** - `1` if `string` is IPv6 address, `0` otherwise. Type: [UInt8](../../sql-reference/data-types/int-uint.md). **Examples** Query: ``` sql SELECT addr, isIPv6String(addr) FROM ( SELECT ['::', '1111::ffff', '::ffff:127.0.0.1', '127.0.0.1'] AS addr ) ARRAY JOIN addr ``` Result: ``` text ┌─addr─────────────┬─isIPv6String(addr)─┐ │ :: │ 1 │ │ 1111::ffff │ 1 │ │ ::ffff:127.0.0.1 │ 1 │ │ 127.0.0.1 │ 0 │ └──────────────────┴────────────────────┘ ``` [Original article](https://clickhouse.tech/docs/en/query_language/functions/ip_address_functions/)