I would think one of dynamic DNS client utilities might do this... Check through the list here and see if any allow running an external command on detection ...

Feel smarter than your router in 60 seconds.

The bash script described here can change Linux systems' IP addresses from dynamic to static with much less manual work. Changing the IP address of a Linux system from dynamic to static is not ...

Internet Protocol (IP) is a numerical identifier for every gadget or network for users accessing the internet. The IP address of a user contains information like location, network identification, ...