81.173.13 is a class C of IPs

Sample IPs from the class C 81.173.13

81.173.13.20	View precise location of 81.173.13.20 on the map!
81.173.13.162	View precise location of 81.173.13.162 on the map!
81.173.13.229	View precise location of 81.173.13.229 on the map!
81.173.13.125	View precise location of 81.173.13.125 on the map!
81.173.13.52	View precise location of 81.173.13.52 on the map!
81.173.13.115	View precise location of 81.173.13.115 on the map!
81.173.13.161	View precise location of 81.173.13.161 on the map!
81.173.13.240	View precise location of 81.173.13.240 on the map!
81.173.13.84	View precise location of 81.173.13.84 on the map!
81.173.13.166	View precise location of 81.173.13.166 on the map!
81.173.13.70	View precise location of 81.173.13.70 on the map!

10 Random IPs

131.74.8.237	Find precise map location of 131.74.8.237
87.189.36.178	Find precise map location of 87.189.36.178
95.184.93.65	Find precise map location of 95.184.93.65
101.19.85.88	Find precise map location of 101.19.85.88
104.6.39.202	Find precise map location of 104.6.39.202
231.176.169.153	Find precise map location of 231.176.169.153
205.54.174.36	Find precise map location of 205.54.174.36
10.217.211.239	Find precise map location of 10.217.211.239
255.131.109.160	Find precise map location of 255.131.109.160
68.200.53.239	Find precise map location of 68.200.53.239
242.209.63.84	Find precise map location of 242.209.63.84

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