ip-api.com's service of providing IP and domain information service is easy to integrate, no API key needed for non-commercial use. Accessible in JSON, XML, CSV, Newline, PHP, and easy to incorporate. Serving more than 1 billion demands a day, which thousands of organisations trust.
Since 2012, IP-API has been running, and they now deliver one of the most common and accurate IP Geolocation APIs.
As soon as they have new information regarding an IP block, they update their database. You'll already have the most reliable location details for each API search, without having to think about upgrading a local database.