64.16.21 is a class C of IPs

Sample IPs from the class C 64.16.21

64.16.21.80	View precise location of 64.16.21.80 on the map!
64.16.21.16	View precise location of 64.16.21.16 on the map!
64.16.21.75	View precise location of 64.16.21.75 on the map!
64.16.21.4	View precise location of 64.16.21.4 on the map!
64.16.21.141	View precise location of 64.16.21.141 on the map!
64.16.21.135	View precise location of 64.16.21.135 on the map!
64.16.21.123	View precise location of 64.16.21.123 on the map!
64.16.21.135	View precise location of 64.16.21.135 on the map!
64.16.21.235	View precise location of 64.16.21.235 on the map!
64.16.21.132	View precise location of 64.16.21.132 on the map!
64.16.21.91	View precise location of 64.16.21.91 on the map!

10 Random IPs

245.16.33.122	Find precise map location of 245.16.33.122
197.23.90.144	Find precise map location of 197.23.90.144
1.75.21.147	Find precise map location of 1.75.21.147
129.182.37.191	Find precise map location of 129.182.37.191
75.46.191.103	Find precise map location of 75.46.191.103
229.35.234.183	Find precise map location of 229.35.234.183
229.225.64.182	Find precise map location of 229.225.64.182
160.28.51.120	Find precise map location of 160.28.51.120
201.118.54.45	Find precise map location of 201.118.54.45
135.245.56.5	Find precise map location of 135.245.56.5
79.41.199.227	Find precise map location of 79.41.199.227

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