IP Guide - Look up IP addresses, networks, and ASNs
Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.
whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
ShowIP - ShowIP displays the IP address(es) of the current page in the status bar.
BreachLock - BreachLock is a versatile platform that provides scalable and smooth penetration testing services for vulnerabilities.