81.66.80 is a class C of IPs

Sample IPs from the class C 81.66.80

81.66.80.173	View precise location of 81.66.80.173 on the map!
81.66.80.148	View precise location of 81.66.80.148 on the map!
81.66.80.74	View precise location of 81.66.80.74 on the map!
81.66.80.211	View precise location of 81.66.80.211 on the map!
81.66.80.153	View precise location of 81.66.80.153 on the map!
81.66.80.22	View precise location of 81.66.80.22 on the map!
81.66.80.35	View precise location of 81.66.80.35 on the map!
81.66.80.241	View precise location of 81.66.80.241 on the map!
81.66.80.31	View precise location of 81.66.80.31 on the map!
81.66.80.117	View precise location of 81.66.80.117 on the map!
81.66.80.55	View precise location of 81.66.80.55 on the map!

10 Random IPs

72.11.74.161	Find precise map location of 72.11.74.161
171.103.85.218	Find precise map location of 171.103.85.218
234.122.131.69	Find precise map location of 234.122.131.69
179.140.129.188	Find precise map location of 179.140.129.188
207.164.19.232	Find precise map location of 207.164.19.232
137.223.153.105	Find precise map location of 137.223.153.105
249.89.115.204	Find precise map location of 249.89.115.204
237.154.88.177	Find precise map location of 237.154.88.177
14.156.83.248	Find precise map location of 14.156.83.248
166.219.121.185	Find precise map location of 166.219.121.185
32.240.67.110	Find precise map location of 32.240.67.110

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