With its API, GoDaddy makes it easy to do dynamic DNS updates for your domain's hostnames. I made it easy to do with Perl with Net::DynDNS::GoDaddy (which uses my new Addr::MyIP to get your current external IP address). I'll give an example, then an example use of the distribution's packaged binary script.

use Addr::MyIP;
use Net::DynDNS::GoDaddy;
 
my $hostname = 'home';
my $domain   = 'example.com';
 
my $current_host_ip = host_ip_get($hostname, $domain);
my $my_ip = myip();
 
if ($current_host_ip ne $my_ip) {
    host_ip_set($host, $domain, $my_ip);
}
[download]

Simple. The library requires a godaddy_api.json file in your home directory (MacOS, Unix or Windows, the software has 100% test coverage on all systems) that looks like this:

{
   "api_key" : "api_key",
   "api_secret" : "api_secret"
}
[download]

Using the binary we'll install when you install the library, it will prompt you for this information on its initial run:

> update-ip home example.com

Please enter your GoDaddy API key and hit ENTER: ...api_key...

Please enter your GoDaddy API secret and hit ENTER: ..api_secret... 

Updated record for 'home.example.com' from x.x.x.x to x.x.x.x
[download]

...after the initial run, it won't prompt anymore:

> update-ip home example.com
Not updating the 'home.example.com' record, IPs are the same
[download]

You can specify the IP if you don't want to use your current public-facing one we automatically get for you:

> update-ip home example.com 10.7.10.2
[download]

The most useful use for me is to have multiple hostnames ('home', 'office', 'roaming' etc) and just run the program through cron:

# Home storage server
*/15 * * * * update-ip home example.com >> /tmp/update-home_cron.log 2
+>&1
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My laptop:

*/15 * * * * update-ip roaming example.com >> /tmp/update-roaming_cron
+.log 2>&1
[download]

Usage:

Usage: update-ip host domain.name [ip.addr]
[download]

Have fun!

-stevieb