81.61 is a class B of IPs

Sample IPs from the class B 81.61

81.61.174.33	View precise location of 81.61.174.33 on the map!
81.61.143.90	View precise location of 81.61.143.90 on the map!
81.61.152.34	View precise location of 81.61.152.34 on the map!
81.61.53.253	View precise location of 81.61.53.253 on the map!
81.61.153.106	View precise location of 81.61.153.106 on the map!
81.61.132.40	View precise location of 81.61.132.40 on the map!
81.61.144.25	View precise location of 81.61.144.25 on the map!
81.61.59.153	View precise location of 81.61.59.153 on the map!
81.61.137.141	View precise location of 81.61.137.141 on the map!
81.61.86.49	View precise location of 81.61.86.49 on the map!
81.61.97.16	View precise location of 81.61.97.16 on the map!

10 Random IPs

128.160.133.190	Find precise map location of 128.160.133.190
157.43.149.56	Find precise map location of 157.43.149.56
186.106.88.150	Find precise map location of 186.106.88.150
116.111.243.141	Find precise map location of 116.111.243.141
100.177.116.167	Find precise map location of 100.177.116.167
255.194.36.164	Find precise map location of 255.194.36.164
66.216.159.90	Find precise map location of 66.216.159.90
128.68.20.251	Find precise map location of 128.68.20.251
142.148.108.111	Find precise map location of 142.148.108.111
181.55.5.235	Find precise map location of 181.55.5.235
58.239.177.76	Find precise map location of 58.239.177.76

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