~$ curl http://api.db-ip.com/v2/free/181.64.155.109
{
    "ipAddress": "181.64.155.109",
	"continentCode": "SA",
	"continentName": "South America",
	"countryCode": "PE",
	"countryName": "Peru",
	"stateProv": "Municipalidad Metropolitana De Lima",
	"city": "Cercado de Lima",
}

~$ curl http://api.db-ip.com/v2/free/181.64.155.109/countryName
Peru

The free API is limited to 1,000 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.