Simple and really free
IP Geolocation API

No account or API key needed. Public REST API.
Unlike others, we promise we will stay free!

API Endpoint

About is a free public IP location API to lookup the city and country of any IP address. Find time zone, latitude and longitude of geolocations.
Bored? Try looking up where's IP location is.

No account needed and no limits. Just play nice. Abusive IPs will be blocked. Other than that, the reallyfreegeoip location service is free and public.

JSON API Endpoint