21.18.91 is a class C of IPs

Sample IPs from the class C 21.18.91

21.18.91.20	View precise location of 21.18.91.20 on the map!
21.18.91.104	View precise location of 21.18.91.104 on the map!
21.18.91.92	View precise location of 21.18.91.92 on the map!
21.18.91.166	View precise location of 21.18.91.166 on the map!
21.18.91.213	View precise location of 21.18.91.213 on the map!
21.18.91.100	View precise location of 21.18.91.100 on the map!
21.18.91.204	View precise location of 21.18.91.204 on the map!
21.18.91.73	View precise location of 21.18.91.73 on the map!
21.18.91.164	View precise location of 21.18.91.164 on the map!
21.18.91.171	View precise location of 21.18.91.171 on the map!
21.18.91.146	View precise location of 21.18.91.146 on the map!

10 Random IPs

14.40.85.161	Find precise map location of 14.40.85.161
31.5.110.140	Find precise map location of 31.5.110.140
53.239.224.229	Find precise map location of 53.239.224.229
52.149.79.210	Find precise map location of 52.149.79.210
80.15.72.248	Find precise map location of 80.15.72.248
190.37.198.139	Find precise map location of 190.37.198.139
78.96.173.162	Find precise map location of 78.96.173.162
228.153.245.114	Find precise map location of 228.153.245.114
101.66.219.83	Find precise map location of 101.66.219.83
150.249.1.55	Find precise map location of 150.249.1.55
79.81.129.8	Find precise map location of 79.81.129.8

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