21.216.221 is a class C of IPs

Sample IPs from the class C 21.216.221

21.216.221.30	View precise location of 21.216.221.30 on the map!
21.216.221.122	View precise location of 21.216.221.122 on the map!
21.216.221.32	View precise location of 21.216.221.32 on the map!
21.216.221.33	View precise location of 21.216.221.33 on the map!
21.216.221.84	View precise location of 21.216.221.84 on the map!
21.216.221.194	View precise location of 21.216.221.194 on the map!
21.216.221.203	View precise location of 21.216.221.203 on the map!
21.216.221.148	View precise location of 21.216.221.148 on the map!
21.216.221.184	View precise location of 21.216.221.184 on the map!
21.216.221.84	View precise location of 21.216.221.84 on the map!
21.216.221.133	View precise location of 21.216.221.133 on the map!

10 Random IPs

217.214.37.211	Find precise map location of 217.214.37.211
127.158.248.208	Find precise map location of 127.158.248.208
63.32.97.182	Find precise map location of 63.32.97.182
39.34.146.200	Find precise map location of 39.34.146.200
38.180.57.141	Find precise map location of 38.180.57.141
137.178.242.57	Find precise map location of 137.178.242.57
191.229.8.19	Find precise map location of 191.229.8.19
250.161.150.117	Find precise map location of 250.161.150.117
253.165.48.249	Find precise map location of 253.165.48.249
145.104.76.183	Find precise map location of 145.104.76.183
17.243.50.225	Find precise map location of 17.243.50.225

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