IP check script

I need a simple IP script coded. For example, say I have a few computers but the IPs change alot (they are dynamic). I want a script or program on each PC which checks for the IP and posts it to a url (I will give you my domain and hosting info). So for example, it would be [login to view URL], [login to view URL], etc.. and each page lists the IP for a corresponding PC. I imagine this should be pretty simple if you use an API for an IP check website. Will give preference to the person who can get it done the fastest with a reasonable price. Must speak good english as well. You can code this in any language you want, but I assume PHP would be easiest (maybe I am wrong). It can be either a script or a "bot" (if you plan on using another language). Thanks