138.21.187 is a class C of IPs

Sample IPs from the class C 138.21.187

138.21.187.14	View precise location of 138.21.187.14 on the map!
138.21.187.194	View precise location of 138.21.187.194 on the map!
138.21.187.128	View precise location of 138.21.187.128 on the map!
138.21.187.130	View precise location of 138.21.187.130 on the map!
138.21.187.208	View precise location of 138.21.187.208 on the map!
138.21.187.170	View precise location of 138.21.187.170 on the map!
138.21.187.170	View precise location of 138.21.187.170 on the map!
138.21.187.8	View precise location of 138.21.187.8 on the map!
138.21.187.169	View precise location of 138.21.187.169 on the map!
138.21.187.205	View precise location of 138.21.187.205 on the map!
138.21.187.98	View precise location of 138.21.187.98 on the map!

10 Random IPs

227.169.205.182	Find precise map location of 227.169.205.182
86.42.215.141	Find precise map location of 86.42.215.141
154.3.72.26	Find precise map location of 154.3.72.26
83.13.227.133	Find precise map location of 83.13.227.133
251.85.245.89	Find precise map location of 251.85.245.89
186.38.45.117	Find precise map location of 186.38.45.117
207.145.33.48	Find precise map location of 207.145.33.48
106.22.22.122	Find precise map location of 106.22.22.122
253.250.87.63	Find precise map location of 253.250.87.63
113.212.199.206	Find precise map location of 113.212.199.206
221.245.180.16	Find precise map location of 221.245.180.16

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