81.161.246.106 or bib2.tu-sofia.bg is an IPv4 address owned by Technical University - Sofia and located in Sofia, Bulgaria
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~$ curl http://api.db-ip.com/v2/free/81.161.246.106
{
"ipAddress": "81.161.246.106",
"continentCode": "EU",
"continentName": "Europe",
"countryCode": "BG",
"countryName": "Bulgaria",
"stateProv": "Sofia-grad",
"city": "Sofia",
}
~$ curl http://api.db-ip.com/v2/free/81.161.246.106/countryName
Bulgaria
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.