81.255.140 is a class C of IPs

Sample IPs from the class C 81.255.140

81.255.140.99	View precise location of 81.255.140.99 on the map!
81.255.140.65	View precise location of 81.255.140.65 on the map!
81.255.140.87	View precise location of 81.255.140.87 on the map!
81.255.140.79	View precise location of 81.255.140.79 on the map!
81.255.140.18	View precise location of 81.255.140.18 on the map!
81.255.140.168	View precise location of 81.255.140.168 on the map!
81.255.140.68	View precise location of 81.255.140.68 on the map!
81.255.140.17	View precise location of 81.255.140.17 on the map!
81.255.140.136	View precise location of 81.255.140.136 on the map!
81.255.140.17	View precise location of 81.255.140.17 on the map!
81.255.140.104	View precise location of 81.255.140.104 on the map!

10 Random IPs

132.130.142.159	Find precise map location of 132.130.142.159
194.121.38.93	Find precise map location of 194.121.38.93
78.133.36.30	Find precise map location of 78.133.36.30
97.5.142.242	Find precise map location of 97.5.142.242
194.39.253.39	Find precise map location of 194.39.253.39
224.72.106.188	Find precise map location of 224.72.106.188
128.251.199.118	Find precise map location of 128.251.199.118
106.218.34.194	Find precise map location of 106.218.34.194
52.197.33.195	Find precise map location of 52.197.33.195
204.189.185.32	Find precise map location of 204.189.185.32
150.179.147.10	Find precise map location of 150.179.147.10

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