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ip2long — Converts a dotted-quad address into a decimal, IPv4 network address.


int ip2long(ip_address);
string ip_address: IPv4 dotted-quad address


Signed integer


ip2long() converts a dotted-quad format IP address ( to a decimal, IPv4 network address. Add pow(2,32) (4,294,967,296) to "unsign" the value.


PHP Version: 4.0b4+

See also



Example 842. Convert an IP address from one format to another

$IP = '';
// We add 2^32 (4,294,967,296) to unsign the value
echo "The dotted-quad format IP address $IP is equivalent to ", ip2long ($IP) + pow(2,32);

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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