ipinfo.io - Simple IP address information.
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.
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
IP Address and Domain Information - This extension displays detailed information about the current website.
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.