JavaScript inet_ntop

Converts a packed inet address to a human readable IP address string

function inet_ntop (a) {
    // Converts a packed inet address to a human readable IP address string  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/inet_ntop    // +   original by: Theriault
    // *     example 1: inet_ntop('\x7F\x00\x00\x01');
    // *     returns 1: '127.0.0.1'
    // *     example 2: inet_ntop('\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1');
    // *     returns 2: '::1'    var i = 0,
        m = '',
        c = [];
    a += '';
    if (a.length === 4) { // IPv4        return [
        a.charCodeAt(0), a.charCodeAt(1), a.charCodeAt(2), a.charCodeAt(3)].join('.');
    } else if (a.length === 16) { // IPv6
        for (i = 0; i < 16; i++) {
            c.push(((a.charCodeAt(i++) << 8) + a.charCodeAt(i)).toString(16));        }
        return c.join(':').replace(/((^|:)0(?=:|$))+:?/g, function (t) {
            m = (t.length > m.length) ? t : m;
            return t;
        }).replace(m || ' ', '::');    } else { // Invalid length
        return false;
    }
}

external links: original PHP docs | raw js source

Examples

» Example 1

Running

1	inet_ntop('\x7F\x00\x00\x01');

Should return

1	'127.0.0.1'

» Example 2

Running

1	inet_ntop('\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1');

Should return

'::1'

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

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