C:\temp>nslookup jyumin.fan.cx
Server:  web.setup
Address:  192.168.0.1

Non-authoritative answer:
Name:    fan.cx
Address:  61.197.187.235
Aliases:  jyumin.fan.cx


C:\temp>nslookup 61.197.187.235
Server:  web.setup
Address:  192.168.0.1

Name:    relay.agora-inc.jp
Address:  61.197.187.235
Aliases:  235.187.197.61.in-addr.arpa