5.18.251.36 or 5x18x251x36.static-business.spb.ertelecom.ru is an IPv4 address owned by Z-Telecom and located in St Petersburg, Russia
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~$ curl http://api.db-ip.com/v2/free/5.18.251.36
{
"ipAddress": "5.18.251.36",
"continentCode": "EU",
"continentName": "Europe",
"countryCode": "RU",
"countryName": "Russia",
"stateProv": "St.-Petersburg",
"city": "St Petersburg",
}
~$ curl http://api.db-ip.com/v2/free/5.18.251.36/countryName
Russia
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.