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ClickHouse/docs/en/sql-reference/functions/ip-address-functions.md
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---
slug: /en/sql-reference/functions/ip-address-functions
sidebar_position: 95
sidebar_label: IP Addresses
---
# Functions for Working with IPv4 and IPv6 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).
Alias: `INET_NTOA`.
## IPv4StringToNum(s)
The reverse function of IPv4NumToString. If the IPv4 address has an invalid format, it throws exception.
Alias: `INET_ATON`.
## IPv4StringToNumOrDefault(s)
Same as `IPv4StringToNum`, but if the IPv4 address has an invalid format, it returns 0.
## IPv4StringToNumOrNull(s)
Same as `IPv4StringToNum`, but if the IPv4 address has an invalid format, it returns null.
## 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
```
``` 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 do not 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.
Alias: `INET6_NTOA`.
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
The reverse function of [IPv6NumToString](#ipv6numtostringx). If the IPv6 address has an invalid format, it throws exception.
If the input string contains a valid IPv4 address, returns its IPv6 equivalent.
HEX can be uppercase or lowercase.
Alias: `INET6_ATON`.
**Syntax**
``` sql
IPv6StringToNum(string)
```
**Argument**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- IPv6 address in binary format. [FixedString(16)](../data-types/fixedstring.md).
**Example**
Query:
``` sql
SELECT addr, cutIPv6(IPv6StringToNum(addr), 0, 0) FROM (SELECT ['notaddress', '127.0.0.1', '1111::ffff'] AS addr) ARRAY JOIN addr;
```
Result:
``` text
┌─addr───────┬─cutIPv6(IPv6StringToNum(addr), 0, 0)─┐
│ notaddress │ :: │
│ 127.0.0.1 │ ::ffff:127.0.0.1 │
│ 1111::ffff │ 1111::ffff │
└────────────┴──────────────────────────────────────┘
```
**See Also**
- [cutIPv6](#cutipv6x-bytestocutforipv6-bytestocutforipv4).
## IPv6StringToNumOrDefault(s)
Same as `IPv6StringToNum`, but if the IPv6 address has an invalid format, it returns 0.
## IPv6StringToNumOrNull(s)
Same as `IPv6StringToNum`, but if the IPv6 address has an invalid format, it returns null.
## IPv4ToIPv6(x)
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)
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),
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),
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
Like [`IPv4StringToNum`](##IPv4NumToString(num)) but takes a string form of IPv4 address and returns value of [IPv4](../data-types/ipv4.md) type.
**Syntax**
```sql
toIPv4(string)
```
**Arguments**
- `string` — IPv4 address. [String](../data-types/string.md).
**Returned value**
- `string` converted to the IPv4 address. [IPv4](../data-types/ipv4.md).
**Examples**
Query:
``` sql
SELECT toIPv4('171.225.130.45');
```
Result:
``` text
┌─toIPv4('171.225.130.45')─┐
│ 171.225.130.45 │
└──────────────────────────┘
```
Query:
``` sql
WITH
'171.225.130.45' as IPv4_string
SELECT
hex(IPv4StringToNum(IPv4_string)),
hex(toIPv4(IPv4_string))
```
Result:
``` text
┌─hex(IPv4StringToNum(IPv4_string))─┬─hex(toIPv4(IPv4_string))─┐
│ ABE1822D │ ABE1822D │
└───────────────────────────────────┴──────────────────────────┘
```
## toIPv4OrDefault
Same as `toIPv4`, but if the IPv4 address has an invalid format, it returns `0.0.0.0` (0 IPv4), or the provided IPv4 default.
**Syntax**
```sql
toIPv4OrDefault(string[, default])
```
**Arguments**
- `value` — IP address. [String](../data-types/string.md).
- `default` (optional) — The value to return if `string` has an invalid format. [IPv4](../data-types/ipv4.md).
**Returned value**
- `string` converted to the current IPv4 address. [String](../data-types/string.md).
**Example**
Query:
```sql
WITH
'::ffff:127.0.0.1' AS valid_IPv6_string,
'fe80:2030:31:24' AS invalid_IPv6_string
SELECT
toIPv4OrDefault(valid_IPv6_string) AS valid,
toIPv4OrDefault(invalid_IPv6_string) AS default,
toIPv4OrDefault(invalid_IPv6_string, toIPv4('1.1.1.1')) AS provided_default;
```
Result:
```response
┌─valid───┬─default─┬─provided_default─┐
│ 0.0.0.0 │ 0.0.0.0 │ 1.1.1.1 │
└─────────┴─────────┴──────────────────┘
```
## toIPv4OrNull
Same as [`toIPv4`](#toipv4), but if the IPv4 address has an invalid format, it returns null.
**Syntax**
```sql
toIPv4OrNull(string)
```
**Arguments**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- `string` converted to the current IPv4 address, or null if `string` is an invalid address. [String](../data-types/string.md).
**Example**
Query:
``` sql
WITH 'fe80:2030:31:24' AS invalid_IPv6_string
SELECT toIPv4OrNull(invalid_IPv6_string);
```
Result:
``` text
┌─toIPv4OrNull(invalid_IPv6_string)─┐
│ ᴺᵁᴸᴸ │
└───────────────────────────────────┘
```
## toIPv4OrZero
Same as [`toIPv4`](#toipv4), but if the IPv4 address has an invalid format, it returns `0.0.0.0`.
**Syntax**
```sql
toIPv4OrZero(string)
```
**Arguments**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- `string` converted to the current IPv4 address, or `0.0.0.0` if `string` is an invalid address. [String](../data-types/string.md).
**Example**
Query:
``` sql
WITH 'Not an IP address' AS invalid_IPv6_string
SELECT toIPv4OrZero(invalid_IPv6_string);
```
Result:
``` text
┌─toIPv4OrZero(invalid_IPv6_string)─┐
│ 0.0.0.0 │
└───────────────────────────────────┘
```
## toIPv6
Converts a string form of IPv6 address to [IPv6](../data-types/ipv6.md) type. If the IPv6 address has an invalid format, returns an empty value.
Similar to [IPv6StringToNum](#ipv6stringtonum) function, which converts IPv6 address to binary format.
If the input string contains a valid IPv4 address, then the IPv6 equivalent of the IPv4 address is returned.
**Syntax**
```sql
toIPv6(string)
```
**Argument**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- IP address. [IPv6](../data-types/ipv6.md).
**Examples**
Query:
``` sql
WITH '2001:438:ffff::407d:1bc1' AS IPv6_string
SELECT
hex(IPv6StringToNum(IPv6_string)),
hex(toIPv6(IPv6_string));
```
Result:
``` text
┌─hex(IPv6StringToNum(IPv6_string))─┬─hex(toIPv6(IPv6_string))─────────┐
│ 20010438FFFF000000000000407D1BC1 │ 20010438FFFF000000000000407D1BC1 │
└───────────────────────────────────┴──────────────────────────────────┘
```
Query:
``` sql
SELECT toIPv6('127.0.0.1');
```
Result:
``` text
┌─toIPv6('127.0.0.1')─┐
│ ::ffff:127.0.0.1 │
└─────────────────────┘
```
## toIPv6OrDefault
Same as [`toIPv6`](#toipv6), but if the IPv6 address has an invalid format, it returns `::` (0 IPv6) or the provided IPv6 default.
**Syntax**
```sql
toIPv6OrDefault(string[, default])
```
**Argument**
- `string` — IP address. [String](../data-types/string.md).
- `default` (optional) — The value to return if `string` has an invalid format. [IPv6](../data-types/ipv6.md).
**Returned value**
- IPv6 address [IPv6](../data-types/ipv6.md), otherwise `::` or the provided optional default if `string` has an invalid format.
**Example**
Query:
``` sql
WITH
'127.0.0.1' AS valid_IPv4_string,
'127.0.0.1.6' AS invalid_IPv4_string
SELECT
toIPv6OrDefault(valid_IPv4_string) AS valid,
toIPv6OrDefault(invalid_IPv4_string) AS default,
toIPv6OrDefault(invalid_IPv4_string, toIPv6('1.1.1.1')) AS provided_default
```
Result:
``` text
┌─valid────────────┬─default─┬─provided_default─┐
│ ::ffff:127.0.0.1 │ :: │ ::ffff:1.1.1.1 │
└──────────────────┴─────────┴──────────────────┘
```
## toIPv6OrNull
Same as [`toIPv6`](#toipv6), but if the IPv6 address has an invalid format, it returns null.
**Syntax**
```sql
toIPv6OrNull(string)
```
**Argument**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- IP address. [IPv6](../data-types/ipv6.md), or null if `string` is not a valid format.
**Example**
Query:
``` sql
WITH '127.0.0.1.6' AS invalid_IPv4_string
SELECT toIPv6OrNull(invalid_IPv4_string);
```
Result:
``` text
┌─toIPv6OrNull(invalid_IPv4_string)─┐
│ ᴺᵁᴸᴸ │
└───────────────────────────────────┘
```
## toIPv6OrZero
Same as [`toIPv6`](#toipv6), but if the IPv6 address has an invalid format, it returns `::`.
**Syntax**
```sql
toIPv6OrZero(string)
```
**Argument**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- IP address. [IPv6](../data-types/ipv6.md), or `::` if `string` is not a valid format.
**Example**
Query:
``` sql
WITH '127.0.0.1.6' AS invalid_IPv4_string
SELECT toIPv6OrZero(invalid_IPv4_string);
```
Result:
``` text
┌─toIPv6OrZero(invalid_IPv4_string)─┐
│ :: │
└───────────────────────────────────┘
```
## IPv6StringToNumOrDefault(s)
Same as `toIPv6`, but if the IPv6 address has an invalid format, it returns 0.
## IPv6StringToNumOrNull(s)
Same as `toIPv6`, but if the IPv6 address has an invalid format, it returns null.
## isIPv4String
Determines whether the input string is an IPv4 address or not. If `string` is IPv6 address returns `0`.
**Syntax**
```sql
isIPv4String(string)
```
**Arguments**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- `1` if `string` is IPv4 address, `0` otherwise. [UInt8](../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
Determines whether the input string is an IPv6 address or not. If `string` is IPv4 address returns `0`.
**Syntax**
```sql
isIPv6String(string)
```
**Arguments**
- `string` — IP address. [String](../data-types/string.md).
**Returned value**
- `1` if `string` is IPv6 address, `0` otherwise. [UInt8](../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 │
└──────────────────┴────────────────────┘
```
## isIPAddressInRange
Determines if an IP address is contained in a network represented in the [CIDR](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing) notation. Returns `1` if true, or `0` otherwise.
**Syntax**
``` sql
isIPAddressInRange(address, prefix)
```
This function accepts both IPv4 and IPv6 addresses (and networks) represented as strings. It returns `0` if the IP version of the address and the CIDR don't match.
**Arguments**
- `address` — An IPv4 or IPv6 address. [String](../data-types/string.md).
- `prefix` — An IPv4 or IPv6 network prefix in CIDR. [String](../data-types/string.md).
**Returned value**
- `1` or `0`. [UInt8](../data-types/int-uint.md).
**Example**
Query:
``` sql
SELECT isIPAddressInRange('127.0.0.1', '127.0.0.0/8');
```
Result:
``` text
┌─isIPAddressInRange('127.0.0.1', '127.0.0.0/8')─┐
│ 1 │
└────────────────────────────────────────────────┘
```
Query:
``` sql
SELECT isIPAddressInRange('127.0.0.1', 'ffff::/16');
```
Result:
``` text
┌─isIPAddressInRange('127.0.0.1', 'ffff::/16')─┐
│ 0 │
└──────────────────────────────────────────────┘
```
Query:
``` sql
SELECT isIPAddressInRange('::ffff:192.168.0.1', '::ffff:192.168.0.4/128');
```
Result:
``` text
┌─isIPAddressInRange('::ffff:192.168.0.1', '::ffff:192.168.0.4/128')─┐
│ 0 │
└────────────────────────────────────────────────────────────────────┘
```
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