81.18.128 is a class C of IPs

Sample IPs from the class C 81.18.128

81.18.128.142	View precise location of 81.18.128.142 on the map!
81.18.128.234	View precise location of 81.18.128.234 on the map!
81.18.128.101	View precise location of 81.18.128.101 on the map!
81.18.128.190	View precise location of 81.18.128.190 on the map!
81.18.128.153	View precise location of 81.18.128.153 on the map!
81.18.128.249	View precise location of 81.18.128.249 on the map!
81.18.128.33	View precise location of 81.18.128.33 on the map!
81.18.128.204	View precise location of 81.18.128.204 on the map!
81.18.128.197	View precise location of 81.18.128.197 on the map!
81.18.128.190	View precise location of 81.18.128.190 on the map!
81.18.128.94	View precise location of 81.18.128.94 on the map!

10 Random IPs

109.146.239.46	Find precise map location of 109.146.239.46
214.74.47.87	Find precise map location of 214.74.47.87
1.184.186.196	Find precise map location of 1.184.186.196
140.33.101.28	Find precise map location of 140.33.101.28
78.12.171.241	Find precise map location of 78.12.171.241
3.52.166.100	Find precise map location of 3.52.166.100
182.241.90.89	Find precise map location of 182.241.90.89
236.112.169.90	Find precise map location of 236.112.169.90
163.79.170.44	Find precise map location of 163.79.170.44
137.53.140.139	Find precise map location of 137.53.140.139
36.221.58.64	Find precise map location of 36.221.58.64

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