ipinfo.io - Simple IP address information.
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
ifconfig.co - What is my IP address? — The best tool to find your own IP address, and information about it.
IPTools - The "IP Tools" is powerful and handy application for network analyzing.
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.