21.183.81 is a class C of IPs

Sample IPs from the class C 21.183.81

21.183.81.108	View precise location of 21.183.81.108 on the map!
21.183.81.17	View precise location of 21.183.81.17 on the map!
21.183.81.213	View precise location of 21.183.81.213 on the map!
21.183.81.216	View precise location of 21.183.81.216 on the map!
21.183.81.135	View precise location of 21.183.81.135 on the map!
21.183.81.42	View precise location of 21.183.81.42 on the map!
21.183.81.151	View precise location of 21.183.81.151 on the map!
21.183.81.24	View precise location of 21.183.81.24 on the map!
21.183.81.143	View precise location of 21.183.81.143 on the map!
21.183.81.183	View precise location of 21.183.81.183 on the map!
21.183.81.114	View precise location of 21.183.81.114 on the map!

10 Random IPs

57.101.249.67	Find precise map location of 57.101.249.67
62.72.239.183	Find precise map location of 62.72.239.183
21.31.12.228	Find precise map location of 21.31.12.228
172.96.112.241	Find precise map location of 172.96.112.241
79.41.202.158	Find precise map location of 79.41.202.158
241.79.182.222	Find precise map location of 241.79.182.222
166.10.178.147	Find precise map location of 166.10.178.147
38.83.17.255	Find precise map location of 38.83.17.255
238.29.188.36	Find precise map location of 238.29.188.36
49.184.99.17	Find precise map location of 49.184.99.17
44.75.50.135	Find precise map location of 44.75.50.135

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