121.18.168 is a class C of IPs

Sample IPs from the class C 121.18.168

121.18.168.77	View precise location of 121.18.168.77 on the map!
121.18.168.136	View precise location of 121.18.168.136 on the map!
121.18.168.187	View precise location of 121.18.168.187 on the map!
121.18.168.108	View precise location of 121.18.168.108 on the map!
121.18.168.193	View precise location of 121.18.168.193 on the map!
121.18.168.146	View precise location of 121.18.168.146 on the map!
121.18.168.67	View precise location of 121.18.168.67 on the map!
121.18.168.54	View precise location of 121.18.168.54 on the map!
121.18.168.109	View precise location of 121.18.168.109 on the map!
121.18.168.58	View precise location of 121.18.168.58 on the map!
121.18.168.109	View precise location of 121.18.168.109 on the map!

10 Random IPs

151.152.227.76	Find precise map location of 151.152.227.76
254.123.206.101	Find precise map location of 254.123.206.101
230.62.218.42	Find precise map location of 230.62.218.42
15.136.31.211	Find precise map location of 15.136.31.211
224.76.93.18	Find precise map location of 224.76.93.18
230.237.194.107	Find precise map location of 230.237.194.107
141.57.158.137	Find precise map location of 141.57.158.137
229.75.190.114	Find precise map location of 229.75.190.114
59.40.109.22	Find precise map location of 59.40.109.22
163.75.158.62	Find precise map location of 163.75.158.62
160.181.37.174	Find precise map location of 160.181.37.174

TestURI.org is a free web-sniffer.net alternative. It alows you to send custom HTTP request and check the HTTP response.