210.38.139.168 or gyzc.gdou.edu.cn is an IPv4 address owned by Zjou and located in Zhanjiang (Mazhang Qu), China
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~$ curl http://api.db-ip.com/v2/free/210.38.139.168
{
"ipAddress": "210.38.139.168",
"continentCode": "AS",
"continentName": "Asia",
"countryCode": "CN",
"countryName": "China",
"stateProv": "Guangdong",
"city": "Zhanjiang (Mazhang Qu)",
}
~$ curl http://api.db-ip.com/v2/free/210.38.139.168/countryName
China
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.