Abstract IP Geolocation API

Abstract's IP Geolocation API returns the location of any IP address worldwide: city, region, country, postal code, coordinates and time zone, plus the currency, the network (ASN) and connection type, and flags for VPN and proxy addresses. Send the IP address (or nothing, to get the caller's own address) and your key over HTTPS. Responses are JSON. Free plan with a monthly request limit; paid plans for more requests and features.