138.28.12 is a class C of IPs

Sample IPs from the class C 138.28.12

138.28.12.91	View precise location of 138.28.12.91 on the map!
138.28.12.229	View precise location of 138.28.12.229 on the map!
138.28.12.139	View precise location of 138.28.12.139 on the map!
138.28.12.234	View precise location of 138.28.12.234 on the map!
138.28.12.74	View precise location of 138.28.12.74 on the map!
138.28.12.222	View precise location of 138.28.12.222 on the map!
138.28.12.244	View precise location of 138.28.12.244 on the map!
138.28.12.131	View precise location of 138.28.12.131 on the map!
138.28.12.87	View precise location of 138.28.12.87 on the map!
138.28.12.49	View precise location of 138.28.12.49 on the map!
138.28.12.197	View precise location of 138.28.12.197 on the map!

10 Random IPs

226.5.176.185	Find precise map location of 226.5.176.185
194.70.4.237	Find precise map location of 194.70.4.237
206.194.243.231	Find precise map location of 206.194.243.231
135.68.139.242	Find precise map location of 135.68.139.242
154.245.66.39	Find precise map location of 154.245.66.39
168.135.113.177	Find precise map location of 168.135.113.177
242.70.80.140	Find precise map location of 242.70.80.140
15.90.18.81	Find precise map location of 15.90.18.81
16.225.74.220	Find precise map location of 16.225.74.220
34.150.113.33	Find precise map location of 34.150.113.33
169.168.124.89	Find precise map location of 169.168.124.89

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