IP-addresses stored as int results in overflow?

Question

I\'m writing a chat-server in node.js, and I want to store connected users IP-addresses in a mysql database as (unsigned) integers. I have written a javascript method to convert

Answer 1

I revised Evan's final answer a bit, particularly dot2num. It functions the same but might be more readable and is marginally slower.

function ip2num(ip) {
    var parts = ip.split('.');

    var num = 0;
    num += d[0] * Math.pow(2, 24);
    num += d[1] * Math.pow(2, 16);
    num += d[2] * Math.pow(2, 8);
    num += d[3];

    return num;
}

function num2ip(num) {
    var ip = num % 256;

    for (var i=3; i > 0; i--) { 
        num = Math.floor(num / 256);
        ip = num % 256 + '.' + ip;
    }

    return ip;
}