21.56.128 is a class C of IPs

Sample IPs from the class C 21.56.128

21.56.128.220	View precise location of 21.56.128.220 on the map!
21.56.128.16	View precise location of 21.56.128.16 on the map!
21.56.128.74	View precise location of 21.56.128.74 on the map!
21.56.128.139	View precise location of 21.56.128.139 on the map!
21.56.128.76	View precise location of 21.56.128.76 on the map!
21.56.128.8	View precise location of 21.56.128.8 on the map!
21.56.128.242	View precise location of 21.56.128.242 on the map!
21.56.128.215	View precise location of 21.56.128.215 on the map!
21.56.128.52	View precise location of 21.56.128.52 on the map!
21.56.128.136	View precise location of 21.56.128.136 on the map!
21.56.128.227	View precise location of 21.56.128.227 on the map!

10 Random IPs

87.113.185.229	Find precise map location of 87.113.185.229
220.233.136.13	Find precise map location of 220.233.136.13
91.196.182.88	Find precise map location of 91.196.182.88
66.167.203.6	Find precise map location of 66.167.203.6
18.178.141.228	Find precise map location of 18.178.141.228
1.12.192.181	Find precise map location of 1.12.192.181
41.186.68.94	Find precise map location of 41.186.68.94
111.47.31.67	Find precise map location of 111.47.31.67
24.123.241.188	Find precise map location of 24.123.241.188
252.177.168.188	Find precise map location of 252.177.168.188
126.65.238.18	Find precise map location of 126.65.238.18

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