28.21.177 is a class C of IPs

Sample IPs from the class C 28.21.177

28.21.177.185	View precise location of 28.21.177.185 on the map!
28.21.177.163	View precise location of 28.21.177.163 on the map!
28.21.177.211	View precise location of 28.21.177.211 on the map!
28.21.177.86	View precise location of 28.21.177.86 on the map!
28.21.177.127	View precise location of 28.21.177.127 on the map!
28.21.177.123	View precise location of 28.21.177.123 on the map!
28.21.177.212	View precise location of 28.21.177.212 on the map!
28.21.177.17	View precise location of 28.21.177.17 on the map!
28.21.177.52	View precise location of 28.21.177.52 on the map!
28.21.177.240	View precise location of 28.21.177.240 on the map!
28.21.177.101	View precise location of 28.21.177.101 on the map!

10 Random IPs

77.56.72.237	Find precise map location of 77.56.72.237
221.26.217.10	Find precise map location of 221.26.217.10
239.164.243.163	Find precise map location of 239.164.243.163
51.77.3.209	Find precise map location of 51.77.3.209
26.170.27.226	Find precise map location of 26.170.27.226
121.18.192.82	Find precise map location of 121.18.192.82
145.223.206.13	Find precise map location of 145.223.206.13
14.179.166.5	Find precise map location of 14.179.166.5
40.231.49.152	Find precise map location of 40.231.49.152
137.137.249.29	Find precise map location of 137.137.249.29
185.168.140.135	Find precise map location of 185.168.140.135

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