This application will notify you (in several different ways that you choose) when your external IP address changes. I use it to remotely access my home computer to monitor my security cameras when I am away. If my dynamic external IP address changes while I am away, without this app, I would not know it and thereby would be denied access. I set this up to notify me by email when my external IP address changes. This app allows you to set it up as a Windows (or Linux) service so that it runs automatically all the time your computer is on. You can set the interval that you wish this app to check your IP to see if it changed. It uses a file to store your old IP and uses this file to determine if the IP has changed. I suggest you read the discussion threads on this app as it provides some understanding how to run and set up the app, the notifications, and running it as a service. Thanks Gabriel for a great app!
I really like this little program. It's exactly what I was looking for: small, lightweight, free. My issues were 1) I could not get it to use Gmail's servers to send. Luckily I own my own domain name and used the SMTP server for my hosting. 2) Can the program auto-start on windows start? 3) can the program be run and only shown in the taskbar? Thanks for writing this software! Everyone else wanted money, or me to sign up for an account. Both unacceptable. :-) (sorry for double post, created a SF account)