Convert IP Address to numeric (JS)

I’ve been using some fancy functions in SQL to convert to/from an IP Address and Mask – but have needed to do the same within JavaScript.

This is a requirement based on some MySQL functions – eg. INET_NTOA and INET_ATON.

This first one will take an input value – eg. 255.240.0.0 – and return a number (BIGINT / INT64 for calculations – or storing in a database – as we’re needing to do.

    function convertIpToNumeric(ipAddress) {
        var arrIp = ipAddress.split(".");

        var segment1 = parseInt(arrIp[0]);
        var segment2 = parseInt(arrIp[1]);
        var segment3 = parseInt(arrIp[2]);
        var segment4 = parseInt(arrIp[3]);

        //reverse order calc 
        //eg. 255.255.240.0     <-- start at the end
        // 0 + (240*256) + (255*65536) + (255*16777216)
        var calc = segment4 + (segment3 * 256) + (segment2 * 65536) + (segment1 * 16777216);

        return calc;

    }

And – if needing to do the opposite – you can use the following function.

This will take an input value – eg. 167772161 – and return the resultant IP Address :

function convertNumericToIp(bigNumber) {

    var Octet1 = Math.floor(bigNumber / 16777216)
    var RestOfIP = bigNumber - (Octet1 * 16777216)

    var Octet2 = Math.floor(RestOfIP / 65536)
    var RestOfIP = RestOfIP - (Octet2 * 65536)

    var Octet3 = Math.floor(RestOfIP / 256)
        
    var Octet4 = RestOfIP - (Octet3 * 256)

    var returnValue = Octet1 + "." + Octet2 + "." + Octet3 + "." + Octet4; 

    return returnValue;

}
Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s