81.172.66 is a class C of IPs

Sample IPs from the class C 81.172.66

81.172.66.188	View precise location of 81.172.66.188 on the map!
81.172.66.109	View precise location of 81.172.66.109 on the map!
81.172.66.237	View precise location of 81.172.66.237 on the map!
81.172.66.83	View precise location of 81.172.66.83 on the map!
81.172.66.203	View precise location of 81.172.66.203 on the map!
81.172.66.213	View precise location of 81.172.66.213 on the map!
81.172.66.79	View precise location of 81.172.66.79 on the map!
81.172.66.123	View precise location of 81.172.66.123 on the map!
81.172.66.143	View precise location of 81.172.66.143 on the map!
81.172.66.181	View precise location of 81.172.66.181 on the map!
81.172.66.115	View precise location of 81.172.66.115 on the map!

10 Random IPs

172.70.9.219	Find precise map location of 172.70.9.219
239.79.200.146	Find precise map location of 239.79.200.146
67.238.194.158	Find precise map location of 67.238.194.158
21.86.173.27	Find precise map location of 21.86.173.27
234.43.193.79	Find precise map location of 234.43.193.79
235.43.54.195	Find precise map location of 235.43.54.195
229.252.1.221	Find precise map location of 229.252.1.221
162.172.72.150	Find precise map location of 162.172.72.150
37.28.35.255	Find precise map location of 37.28.35.255
15.140.170.238	Find precise map location of 15.140.170.238
3.160.137.79	Find precise map location of 3.160.137.79

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