15.21.187 is a class C of IPs

Sample IPs from the class C 15.21.187

15.21.187.55	View precise location of 15.21.187.55 on the map!
15.21.187.78	View precise location of 15.21.187.78 on the map!
15.21.187.9	View precise location of 15.21.187.9 on the map!
15.21.187.192	View precise location of 15.21.187.192 on the map!
15.21.187.73	View precise location of 15.21.187.73 on the map!
15.21.187.186	View precise location of 15.21.187.186 on the map!
15.21.187.238	View precise location of 15.21.187.238 on the map!
15.21.187.11	View precise location of 15.21.187.11 on the map!
15.21.187.125	View precise location of 15.21.187.125 on the map!
15.21.187.61	View precise location of 15.21.187.61 on the map!
15.21.187.146	View precise location of 15.21.187.146 on the map!

10 Random IPs

129.3.244.173	Find precise map location of 129.3.244.173
91.74.222.143	Find precise map location of 91.74.222.143
169.14.214.229	Find precise map location of 169.14.214.229
216.42.96.36	Find precise map location of 216.42.96.36
100.74.195.101	Find precise map location of 100.74.195.101
126.169.80.5	Find precise map location of 126.169.80.5
146.148.226.38	Find precise map location of 146.148.226.38
83.62.95.220	Find precise map location of 83.62.95.220
22.51.52.93	Find precise map location of 22.51.52.93
144.27.186.220	Find precise map location of 144.27.186.220
90.241.185.65	Find precise map location of 90.241.185.65

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