Gateway IP Monitor is a tool, that is useful for users with a DSL/cable internet connection, who would like monitor their external IP address. The service monitors your external IP address by periodically connecting to a web page on the Internet. You can use the provided monitoring option, or use a page on your own server (script included). If you use the provided option, Gateway IP Monitor checks your IP every 6 hours, however if you upload the script to your own server, you can check the status every few minutes instead. Additional features include email notifications and further automation. Gateway IP Monitor sits in the system tray and reveal your current (external) IP with the click of your mouse.
Gateway IP Monitor is a Windows NT / Win2k / WinXP service that monitors the default gateway's IP address by repeatedly connecting to a web page on the Internet.
By default Gateway IP Monitor notifies you by email if the IP address changes, additionally the newly obtained IP address can also be written to a text log file and/or you can launch a custom application (process).

The license of this software is Freeware, you can free download and free use this ip utility software.