231.81.15 is a class C of IPs

Sample IPs from the class C 231.81.15

231.81.15.92	View precise location of 231.81.15.92 on the map!
231.81.15.30	View precise location of 231.81.15.30 on the map!
231.81.15.37	View precise location of 231.81.15.37 on the map!
231.81.15.89	View precise location of 231.81.15.89 on the map!
231.81.15.166	View precise location of 231.81.15.166 on the map!
231.81.15.78	View precise location of 231.81.15.78 on the map!
231.81.15.104	View precise location of 231.81.15.104 on the map!
231.81.15.53	View precise location of 231.81.15.53 on the map!
231.81.15.86	View precise location of 231.81.15.86 on the map!
231.81.15.205	View precise location of 231.81.15.205 on the map!
231.81.15.19	View precise location of 231.81.15.19 on the map!

10 Random IPs

172.196.101.10	Find precise map location of 172.196.101.10
213.93.132.110	Find precise map location of 213.93.132.110
142.162.210.200	Find precise map location of 142.162.210.200
92.37.126.2	Find precise map location of 92.37.126.2
96.44.199.78	Find precise map location of 96.44.199.78
251.170.140.113	Find precise map location of 251.170.140.113
186.203.37.234	Find precise map location of 186.203.37.234
146.194.34.5	Find precise map location of 146.194.34.5
165.118.113.217	Find precise map location of 165.118.113.217
86.151.247.224	Find precise map location of 86.151.247.224
154.126.79.136	Find precise map location of 154.126.79.136

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