81.31.105 is a class C of IPs

Sample IPs from the class C 81.31.105

81.31.105.183	View precise location of 81.31.105.183 on the map!
81.31.105.152	View precise location of 81.31.105.152 on the map!
81.31.105.154	View precise location of 81.31.105.154 on the map!
81.31.105.1	View precise location of 81.31.105.1 on the map!
81.31.105.94	View precise location of 81.31.105.94 on the map!
81.31.105.38	View precise location of 81.31.105.38 on the map!
81.31.105.254	View precise location of 81.31.105.254 on the map!
81.31.105.192	View precise location of 81.31.105.192 on the map!
81.31.105.9	View precise location of 81.31.105.9 on the map!
81.31.105.12	View precise location of 81.31.105.12 on the map!
81.31.105.85	View precise location of 81.31.105.85 on the map!

10 Random IPs

25.5.119.122	Find precise map location of 25.5.119.122
92.115.205.18	Find precise map location of 92.115.205.18
209.51.141.227	Find precise map location of 209.51.141.227
253.245.47.245	Find precise map location of 253.245.47.245
184.128.12.242	Find precise map location of 184.128.12.242
224.253.72.215	Find precise map location of 224.253.72.215
45.234.48.83	Find precise map location of 45.234.48.83
165.10.29.122	Find precise map location of 165.10.29.122
173.214.74.87	Find precise map location of 173.214.74.87
229.248.56.139	Find precise map location of 229.248.56.139
159.224.255.23	Find precise map location of 159.224.255.23

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