ClickHouse/docs/en/query_language/functions/ip_address_functions.md

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# Functions for working with IP addresses
## IPv4NumToString(num)
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)
The reverse function of IPv4NumToString. If the IPv4 address has an invalid format, it returns 0.
## IPv4NumToStringClassC(num)
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
```
```
┌─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)
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
```
```
┌─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
```
```
┌─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
```
```
┌─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)
The reverse function of IPv6NumToString. If the IPv6 address has an invalid format, it returns a string of null bytes.
HEX can be uppercase or lowercase.
## IPv4ToIPv6(x)
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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
```
```
┌─addr───────────────┐
│ ::ffff:192.168.0.1 │
└────────────────────┘
```
## cutIPv6(x, bitsToCutForIPv6, bitsToCutForIPv4)
Accepts a FixedString(16) value containing the IPv6 address in binary format. Returns a string containing the address of the specified number of bits removed in text format. For example:
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``` 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)
```
```
┌─cutIPv6(ipv6, 2, 0)─────────────────┬─cutIPv6(ipv4, 0, 2)─┐
│ 2001:db8:ac10:fe01:feed:babe:cafe:0 │ ::ffff:192.168.0.0 │
└─────────────────────────────────────┴─────────────────────┘
```
## IPv4CIDRToRange(ipv4, cidr),
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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)
```
```
┌─IPv4CIDRToRange(toIPv4('192.168.5.2'), 16)─┐
│ ('192.168.0.0','192.168.255.255') │
└────────────────────────────────────────────┘
```
## IPv6CIDRToRange(ipv6, 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);
```
```
┌─IPv6CIDRToRange(toIPv6('2001:0db8:0000:85a3:0000:0000:ac1f:8001'), 32)─┐
│ ('2001:db8::','2001:db8:ffff:ffff:ffff:ffff:ffff:ffff') │
└────────────────────────────────────────────────────────────────────────┘
```
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## toIPv4(string)
An alias to `IPv4StringToNum()` that takes a string form of IPv4 address and returns value of [IPv4](../../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))
```
```
┌─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))
```
```
┌─hex(IPv4StringToNum(IPv4_string))─┬─hex(toIPv4(IPv4_string))─┐
│ ABE1822D │ ABE1822D │
└───────────────────────────────────┴──────────────────────────┘
```
## toIPv6(string)
An alias to `IPv6StringToNum()` that takes a string form of IPv6 address and returns value of [IPv6](../../data_types/domains/ipv6.md) type, which is binary equal to value returned by `IPv6StringToNum()`.
``` sql
WITH
'2001:438:ffff::407d:1bc1' as IPv6_string
SELECT
toTypeName(IPv6StringToNum(IPv6_string)),
toTypeName(toIPv6(IPv6_string))
```
```
┌─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))
```
```
┌─hex(IPv6StringToNum(IPv6_string))─┬─hex(toIPv6(IPv6_string))─────────┐
│ 20010438FFFF000000000000407D1BC1 │ 20010438FFFF000000000000407D1BC1 │
└───────────────────────────────────┴──────────────────────────────────┘
```
[Original article](https://clickhouse.yandex/docs/en/query_language/functions/ip_address_functions/) <!--hide-->