GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.
My Public IP - My Public IP is a utility to let you know through which internet IP the world see you.
whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.
What is My IP Live - Find your IPv4 and IPv6 just by visiting whatismyip.live - complete IP geolocation is also provided along with some other useful IP tools.
Skeebus - Skeebus is a macOS menu bar app that displays your current public 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.