81.231.204 is a class C of IPs

Sample IPs from the class C 81.231.204

81.231.204.36	View precise location of 81.231.204.36 on the map!
81.231.204.145	View precise location of 81.231.204.145 on the map!
81.231.204.6	View precise location of 81.231.204.6 on the map!
81.231.204.245	View precise location of 81.231.204.245 on the map!
81.231.204.101	View precise location of 81.231.204.101 on the map!
81.231.204.155	View precise location of 81.231.204.155 on the map!
81.231.204.74	View precise location of 81.231.204.74 on the map!
81.231.204.36	View precise location of 81.231.204.36 on the map!
81.231.204.28	View precise location of 81.231.204.28 on the map!
81.231.204.235	View precise location of 81.231.204.235 on the map!
81.231.204.214	View precise location of 81.231.204.214 on the map!

10 Random IPs

203.151.182.90	Find precise map location of 203.151.182.90
238.21.200.245	Find precise map location of 238.21.200.245
16.71.54.59	Find precise map location of 16.71.54.59
128.197.218.66	Find precise map location of 128.197.218.66
73.114.191.34	Find precise map location of 73.114.191.34
14.136.180.222	Find precise map location of 14.136.180.222
147.220.190.182	Find precise map location of 147.220.190.182
244.183.215.227	Find precise map location of 244.183.215.227
170.1.183.62	Find precise map location of 170.1.183.62
22.78.79.139	Find precise map location of 22.78.79.139
31.31.178.231	Find precise map location of 31.31.178.231

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