My Public IP is described as 'utility to let you know through which internet IP the world see you. This is what is usually called your public IP. This 'Public IP' some time can be static but more often it is assigned by your provider anytime you connect for a new time' and is an app in the Network & Admin category. There are three alternatives to My Public IP for Windows and Mac. The best alternative is Show My IP, which is free. Other great apps like My Public IP are Skeebus (Paid, Open Source) and TrueIP (Free).
Show My IP will display the local and public IPv4 and IPv6 addresses of all you network interfaces. It also shows which public IPs (v4 and v6) are used by default for accessing the internet. The IPs are automatically updated on network changes.