ipinfo.io - Simple IP address information.
IPTools - The "IP Tools" is powerful and handy application for network analyzing.
FindSiteIP.com - Website IP Address & Host Name Locator
IPlist.cc - Get IP details for free through the web or via API.
IP Sidekick - IP Sidekick is a geolocation API that returns information about an IP address.
Ipregistry - Ipregistry is a fast, reliable IP geolocation and threat data API. People use Ipregistry to personalize content, analyze traffic, target ads, block countries but also to prevent abuse by detecting Proxy and Tor users, known spammers and bad bots.