151.66.91 is a class C of IPs

Sample IPs from the class C 151.66.91

151.66.91.141	View precise location of 151.66.91.141 on the map!
151.66.91.226	View precise location of 151.66.91.226 on the map!
151.66.91.160	View precise location of 151.66.91.160 on the map!
151.66.91.47	View precise location of 151.66.91.47 on the map!
151.66.91.10	View precise location of 151.66.91.10 on the map!
151.66.91.100	View precise location of 151.66.91.100 on the map!
151.66.91.18	View precise location of 151.66.91.18 on the map!
151.66.91.106	View precise location of 151.66.91.106 on the map!
151.66.91.87	View precise location of 151.66.91.87 on the map!
151.66.91.159	View precise location of 151.66.91.159 on the map!
151.66.91.139	View precise location of 151.66.91.139 on the map!

10 Random IPs

228.114.8.252	Find precise map location of 228.114.8.252
191.153.173.226	Find precise map location of 191.153.173.226
41.255.161.52	Find precise map location of 41.255.161.52
155.7.206.56	Find precise map location of 155.7.206.56
11.206.157.27	Find precise map location of 11.206.157.27
22.39.72.113	Find precise map location of 22.39.72.113
75.62.97.206	Find precise map location of 75.62.97.206
107.214.79.169	Find precise map location of 107.214.79.169
57.5.202.144	Find precise map location of 57.5.202.144
117.196.154.2	Find precise map location of 117.196.154.2
74.37.124.136	Find precise map location of 74.37.124.136

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