181.83.81 is a class C of IPs

Sample IPs from the class C 181.83.81

181.83.81.245	View precise location of 181.83.81.245 on the map!
181.83.81.16	View precise location of 181.83.81.16 on the map!
181.83.81.203	View precise location of 181.83.81.203 on the map!
181.83.81.160	View precise location of 181.83.81.160 on the map!
181.83.81.240	View precise location of 181.83.81.240 on the map!
181.83.81.12	View precise location of 181.83.81.12 on the map!
181.83.81.1	View precise location of 181.83.81.1 on the map!
181.83.81.34	View precise location of 181.83.81.34 on the map!
181.83.81.57	View precise location of 181.83.81.57 on the map!
181.83.81.115	View precise location of 181.83.81.115 on the map!
181.83.81.173	View precise location of 181.83.81.173 on the map!

10 Random IPs

149.156.188.249	Find precise map location of 149.156.188.249
62.122.29.79	Find precise map location of 62.122.29.79
75.162.34.31	Find precise map location of 75.162.34.31
21.102.103.231	Find precise map location of 21.102.103.231
144.70.143.117	Find precise map location of 144.70.143.117
125.196.228.31	Find precise map location of 125.196.228.31
249.88.109.211	Find precise map location of 249.88.109.211
37.222.131.145	Find precise map location of 37.222.131.145
49.101.51.170	Find precise map location of 49.101.51.170
164.16.94.91	Find precise map location of 164.16.94.91
78.39.220.71	Find precise map location of 78.39.220.71

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