2804:b44:4000:: is an IPv6 address owned by Dialhost Internet Eireli and located in Belo Horizonte, Brazil
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~$ curl http://api.db-ip.com/v2/free/2804:b44:4000::
{
    "ipAddress": "2804:b44:4000::",
	"continentCode": "SA",
	"continentName": "South America",
	"countryCode": "BR",
	"countryName": "Brazil",
	"stateProv": "Minas Gerais",
	"city": "Belo Horizonte",
}
~$ curl http://api.db-ip.com/v2/free/2804:b44:4000::/countryName
Brazil
The 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.