131.87.221 is a class C of IPs

Sample IPs from the class C 131.87.221

131.87.221.237	View precise location of 131.87.221.237 on the map!
131.87.221.190	View precise location of 131.87.221.190 on the map!
131.87.221.16	View precise location of 131.87.221.16 on the map!
131.87.221.166	View precise location of 131.87.221.166 on the map!
131.87.221.226	View precise location of 131.87.221.226 on the map!
131.87.221.241	View precise location of 131.87.221.241 on the map!
131.87.221.22	View precise location of 131.87.221.22 on the map!
131.87.221.58	View precise location of 131.87.221.58 on the map!
131.87.221.161	View precise location of 131.87.221.161 on the map!
131.87.221.5	View precise location of 131.87.221.5 on the map!
131.87.221.183	View precise location of 131.87.221.183 on the map!

10 Random IPs

173.198.237.189	Find precise map location of 173.198.237.189
106.75.199.196	Find precise map location of 106.75.199.196
13.130.59.205	Find precise map location of 13.130.59.205
77.33.108.15	Find precise map location of 77.33.108.15
90.3.85.146	Find precise map location of 90.3.85.146
235.180.125.35	Find precise map location of 235.180.125.35
121.131.125.151	Find precise map location of 121.131.125.151
216.45.185.242	Find precise map location of 216.45.185.242
85.204.63.48	Find precise map location of 85.204.63.48
53.10.253.248	Find precise map location of 53.10.253.248
86.43.163.136	Find precise map location of 86.43.163.136

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