166.175.186.52 or mobile-166-175-186-52.mycingular.net is an IPv4 address owned by AT&T Enterprises, LLC and located in Chicago, Illinois, United States
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~$ curl http://api.db-ip.com/v2/free/166.175.186.52
{
    "ipAddress": "166.175.186.52",
	"continentCode": "NA",
	"continentName": "North America",
	"countryCode": "US",
	"countryName": "United States",
	"stateProv": "Illinois",
	"city": "Chicago",
}~$ curl http://api.db-ip.com/v2/free/166.175.186.52/countryName
United StatesThe free API is limited to 500 daily requests and returns city level location data only, if you require larger query volumes or more information such as latitude/longitude, ISP details or threat level assessment, please see our commercial offers.