138.121.51 is a class C of IPs

Sample IPs from the class C 138.121.51

138.121.51.131	View precise location of 138.121.51.131 on the map!
138.121.51.253	View precise location of 138.121.51.253 on the map!
138.121.51.19	View precise location of 138.121.51.19 on the map!
138.121.51.124	View precise location of 138.121.51.124 on the map!
138.121.51.234	View precise location of 138.121.51.234 on the map!
138.121.51.42	View precise location of 138.121.51.42 on the map!
138.121.51.61	View precise location of 138.121.51.61 on the map!
138.121.51.102	View precise location of 138.121.51.102 on the map!
138.121.51.73	View precise location of 138.121.51.73 on the map!
138.121.51.42	View precise location of 138.121.51.42 on the map!
138.121.51.75	View precise location of 138.121.51.75 on the map!

10 Random IPs

198.211.222.94	Find precise map location of 198.211.222.94
120.223.139.26	Find precise map location of 120.223.139.26
184.111.204.113	Find precise map location of 184.111.204.113
102.47.137.254	Find precise map location of 102.47.137.254
90.4.103.67	Find precise map location of 90.4.103.67
44.69.249.159	Find precise map location of 44.69.249.159
12.47.185.147	Find precise map location of 12.47.185.147
32.171.243.122	Find precise map location of 32.171.243.122
195.48.52.198	Find precise map location of 195.48.52.198
65.246.135.187	Find precise map location of 65.246.135.187
230.16.114.102	Find precise map location of 230.16.114.102

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