What is my IP? - Find out what your IP is. Do not hesitate to open wimip.
GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.
IP-Toolbox.com - IP-Toolbox.com is the best site for quick and easy viewing of your public IP address and other related information.
TrueIP - TrueIP is a small program that runs in the system tray, monitoring your IP address(es).
ShowIP - ShowIP displays the IP address(es) of the current page in the status bar.
Skeebus - Skeebus is a macOS menu bar app that displays your current public IP address