Short List with websites who give us free APIs about IP-lookup
www.ipinfo.io - no signup is required actually :)
www.ipapi.co - no signup
www.geoiplookup.net - simple, but nice :) with xml and no need signup for key
www.extreme-ip-lookup.com - no signup
www.ip-api.com - no signup
www.ipfind.co - required signup for access_key/api_key
www.ipgeolocation.io - required signup
www.ipdata.co - required free signup