ipinfo.io - Simple IP address information.
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database
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.
IP-API.com - Free IP Geolocation API - lookup any IP address
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
IP2Location - IP2Location is a leading provider of IP intelligence service.