123.31.81 is a class C of IPs

Sample IPs from the class C 123.31.81

123.31.81.112	View precise location of 123.31.81.112 on the map!
123.31.81.119	View precise location of 123.31.81.119 on the map!
123.31.81.94	View precise location of 123.31.81.94 on the map!
123.31.81.51	View precise location of 123.31.81.51 on the map!
123.31.81.167	View precise location of 123.31.81.167 on the map!
123.31.81.218	View precise location of 123.31.81.218 on the map!
123.31.81.209	View precise location of 123.31.81.209 on the map!
123.31.81.28	View precise location of 123.31.81.28 on the map!
123.31.81.62	View precise location of 123.31.81.62 on the map!
123.31.81.112	View precise location of 123.31.81.112 on the map!
123.31.81.166	View precise location of 123.31.81.166 on the map!

10 Random IPs

196.101.58.117	Find precise map location of 196.101.58.117
244.168.242.69	Find precise map location of 244.168.242.69
238.234.212.181	Find precise map location of 238.234.212.181
172.121.88.71	Find precise map location of 172.121.88.71
202.138.83.247	Find precise map location of 202.138.83.247
62.143.57.186	Find precise map location of 62.143.57.186
46.170.118.211	Find precise map location of 46.170.118.211
197.206.145.185	Find precise map location of 197.206.145.185
205.146.30.182	Find precise map location of 205.146.30.182
56.193.191.195	Find precise map location of 56.193.191.195
181.249.122.93	Find precise map location of 181.249.122.93

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