IP-API.com provides a fast, reliable geolocation API that is free for non-commercial use without requiring an API key, delivering over a billion requests per day in various formats like JSON, XML, CSV, Newline, and PHP. The API supports searches of any IP address/domain and limits endpoints to 45 HTTP requests per minute from an IP. Users requiring unlimited requests, commercial use, SSL access, or additional support are guided towards the pro service.
Simple, free(ish) api to get lat/long from ip address