57.121.221 is a class C of IPs

Sample IPs from the class C 57.121.221

57.121.221.134	View precise location of 57.121.221.134 on the map!
57.121.221.9	View precise location of 57.121.221.9 on the map!
57.121.221.238	View precise location of 57.121.221.238 on the map!
57.121.221.223	View precise location of 57.121.221.223 on the map!
57.121.221.129	View precise location of 57.121.221.129 on the map!
57.121.221.11	View precise location of 57.121.221.11 on the map!
57.121.221.187	View precise location of 57.121.221.187 on the map!
57.121.221.54	View precise location of 57.121.221.54 on the map!
57.121.221.233	View precise location of 57.121.221.233 on the map!
57.121.221.242	View precise location of 57.121.221.242 on the map!
57.121.221.87	View precise location of 57.121.221.87 on the map!

10 Random IPs

86.113.208.72	Find precise map location of 86.113.208.72
97.5.219.121	Find precise map location of 97.5.219.121
28.59.100.178	Find precise map location of 28.59.100.178
160.135.191.200	Find precise map location of 160.135.191.200
212.221.234.9	Find precise map location of 212.221.234.9
6.91.71.100	Find precise map location of 6.91.71.100
225.87.128.16	Find precise map location of 225.87.128.16
224.23.52.166	Find precise map location of 224.23.52.166
85.234.197.184	Find precise map location of 85.234.197.184
204.49.101.105	Find precise map location of 204.49.101.105
150.2.236.64	Find precise map location of 150.2.236.64

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