PHP 4, PHP 5, PHP 7, PHP 8
ip2long - Converts a string containing an (IPv4) Internet Protocol dotted address into a long integer

ip2long( string$ip ): int|false

The function ip2long generates a long integer representation of IPv4 Internet network address from its Internet standard format (dotted string) representation.

ip2long will also work with non-complete IP addresses. Read http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm for more info.



A standard format address.

Return Values

Returns the long integer or false if ip is invalid.



Because PHP's int type is signed, and many IP addresses will result in negative integers on 32-bit architectures, you need to use the "%u" formatter of sprintf or printf to get the string representation of the unsigned IP address.


ip2long will return -1 for the IP on 32-bit systems due to the integer value overflowing.

Related Functions

Example of ip2long

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