121.51.207 is a class C of IPs

Sample IPs from the class C 121.51.207

121.51.207.154	View precise location of 121.51.207.154 on the map!
121.51.207.81	View precise location of 121.51.207.81 on the map!
121.51.207.76	View precise location of 121.51.207.76 on the map!
121.51.207.229	View precise location of 121.51.207.229 on the map!
121.51.207.22	View precise location of 121.51.207.22 on the map!
121.51.207.58	View precise location of 121.51.207.58 on the map!
121.51.207.164	View precise location of 121.51.207.164 on the map!
121.51.207.138	View precise location of 121.51.207.138 on the map!
121.51.207.112	View precise location of 121.51.207.112 on the map!
121.51.207.132	View precise location of 121.51.207.132 on the map!
121.51.207.236	View precise location of 121.51.207.236 on the map!

10 Random IPs

157.224.177.102	Find precise map location of 157.224.177.102
56.34.10.20	Find precise map location of 56.34.10.20
61.216.86.25	Find precise map location of 61.216.86.25
70.2.112.196	Find precise map location of 70.2.112.196
228.161.15.190	Find precise map location of 228.161.15.190
227.60.77.123	Find precise map location of 227.60.77.123
61.229.79.120	Find precise map location of 61.229.79.120
112.135.2.161	Find precise map location of 112.135.2.161
32.153.86.62	Find precise map location of 32.153.86.62
72.116.4.44	Find precise map location of 72.116.4.44
234.161.1.27	Find precise map location of 234.161.1.27

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