121.144 is a class B of IPs

Sample IPs from the class B 121.144

121.144.214.172	View precise location of 121.144.214.172 on the map!
121.144.18.40	View precise location of 121.144.18.40 on the map!
121.144.241.223	View precise location of 121.144.241.223 on the map!
121.144.17.160	View precise location of 121.144.17.160 on the map!
121.144.100.40	View precise location of 121.144.100.40 on the map!
121.144.128.216	View precise location of 121.144.128.216 on the map!
121.144.50.53	View precise location of 121.144.50.53 on the map!
121.144.21.253	View precise location of 121.144.21.253 on the map!
121.144.66.80	View precise location of 121.144.66.80 on the map!
121.144.86.211	View precise location of 121.144.86.211 on the map!
121.144.91.81	View precise location of 121.144.91.81 on the map!

10 Random IPs

177.48.48.39	Find precise map location of 177.48.48.39
137.169.67.65	Find precise map location of 137.169.67.65
168.79.93.141	Find precise map location of 168.79.93.141
79.247.185.131	Find precise map location of 79.247.185.131
202.241.46.214	Find precise map location of 202.241.46.214
154.129.25.217	Find precise map location of 154.129.25.217
5.48.248.82	Find precise map location of 5.48.248.82
39.241.139.106	Find precise map location of 39.241.139.106
61.83.239.136	Find precise map location of 61.83.239.136
180.135.48.25	Find precise map location of 180.135.48.25
13.46.128.98	Find precise map location of 13.46.128.98

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