231.144.172 is a class C of IPs

Sample IPs from the class C 231.144.172

231.144.172.205	View precise location of 231.144.172.205 on the map!
231.144.172.183	View precise location of 231.144.172.183 on the map!
231.144.172.72	View precise location of 231.144.172.72 on the map!
231.144.172.20	View precise location of 231.144.172.20 on the map!
231.144.172.30	View precise location of 231.144.172.30 on the map!
231.144.172.105	View precise location of 231.144.172.105 on the map!
231.144.172.198	View precise location of 231.144.172.198 on the map!
231.144.172.29	View precise location of 231.144.172.29 on the map!
231.144.172.187	View precise location of 231.144.172.187 on the map!
231.144.172.124	View precise location of 231.144.172.124 on the map!
231.144.172.206	View precise location of 231.144.172.206 on the map!

10 Random IPs

80.234.50.203	Find precise map location of 80.234.50.203
224.221.33.93	Find precise map location of 224.221.33.93
252.249.94.223	Find precise map location of 252.249.94.223
119.54.18.11	Find precise map location of 119.54.18.11
224.251.242.32	Find precise map location of 224.251.242.32
109.230.203.155	Find precise map location of 109.230.203.155
17.141.223.183	Find precise map location of 17.141.223.183
143.39.139.207	Find precise map location of 143.39.139.207
203.12.236.233	Find precise map location of 203.12.236.233
225.43.238.81	Find precise map location of 225.43.238.81
78.66.14.47	Find precise map location of 78.66.14.47

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