51.31 is a class B of IPs

Sample IPs from the class B 51.31

51.31.199.202	View precise location of 51.31.199.202 on the map!
51.31.224.227	View precise location of 51.31.224.227 on the map!
51.31.16.201	View precise location of 51.31.16.201 on the map!
51.31.80.69	View precise location of 51.31.80.69 on the map!
51.31.27.76	View precise location of 51.31.27.76 on the map!
51.31.178.53	View precise location of 51.31.178.53 on the map!
51.31.194.15	View precise location of 51.31.194.15 on the map!
51.31.212.77	View precise location of 51.31.212.77 on the map!
51.31.107.164	View precise location of 51.31.107.164 on the map!
51.31.164.239	View precise location of 51.31.164.239 on the map!
51.31.5.159	View precise location of 51.31.5.159 on the map!

10 Random IPs

27.43.127.216	Find precise map location of 27.43.127.216
181.131.40.232	Find precise map location of 181.131.40.232
115.195.171.242	Find precise map location of 115.195.171.242
56.8.71.246	Find precise map location of 56.8.71.246
211.137.49.37	Find precise map location of 211.137.49.37
104.172.117.146	Find precise map location of 104.172.117.146
110.86.38.32	Find precise map location of 110.86.38.32
111.154.243.80	Find precise map location of 111.154.243.80
3.195.176.48	Find precise map location of 3.195.176.48
185.110.233.114	Find precise map location of 185.110.233.114
121.138.189.226	Find precise map location of 121.138.189.226

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