Sometimes it is important to convert an IP address eg. 127.0.0.1 to an integer or a long for storage in a database for lookups or for various other reasons. Let this be a definitive guide :)

Eg. 127.0.0.1 Can become 2130706433

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PHP

PHP has simple built in library functions to help. Despite them using a 2 instead of “to”.

ip2long('127.0.0.1');  // 2130706433
long2ip(2130706433);   // 127.0.0.1

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Javascript

Javascript has no built in functions but you can create some simple functions to assist with this.

function ipToLong(dot)
{
    var d = dot.split('.');
    return ((((((+d[0])*256)+(+d[1]))*256)+(+d[2]))*256)+(+d[3]);
}

function longToIP(int) {
 	    var part1 = int & 255;
    var part2 = ((int >> 8) & 255);
    var part3 = ((int >> 16) & 255);
    var part4 = ((int >> 24) & 255);

    return part4 + "." + part3 + "." + part2 + "." + part1;
}

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Python

Python has a few options including using the built in socket library. However below is a way to do it without including any external modules.

def IP2Int(ip):
    o = map(int, ip.split('.'))
    res = (16777216 * o[0]) + (65536 * o[1]) + (256 * o[2]) + o[3]
    return res


def Int2IP(ipnum):
    o1 = int(ipnum / 16777216) % 256
    o2 = int(ipnum / 65536) % 256
    o3 = int(ipnum / 256) % 256
    o4 = int(ipnum) % 256
    return '%(o1)s.%(o2)s.%(o3)s.%(o4)s' % locals()