231.209.13 is a class C of IPs

Sample IPs from the class C 231.209.13

231.209.13.129	View precise location of 231.209.13.129 on the map!
231.209.13.247	View precise location of 231.209.13.247 on the map!
231.209.13.239	View precise location of 231.209.13.239 on the map!
231.209.13.53	View precise location of 231.209.13.53 on the map!
231.209.13.204	View precise location of 231.209.13.204 on the map!
231.209.13.202	View precise location of 231.209.13.202 on the map!
231.209.13.53	View precise location of 231.209.13.53 on the map!
231.209.13.65	View precise location of 231.209.13.65 on the map!
231.209.13.14	View precise location of 231.209.13.14 on the map!
231.209.13.83	View precise location of 231.209.13.83 on the map!
231.209.13.255	View precise location of 231.209.13.255 on the map!

10 Random IPs

153.137.206.10	Find precise map location of 153.137.206.10
117.149.31.125	Find precise map location of 117.149.31.125
222.31.8.233	Find precise map location of 222.31.8.233
95.193.109.84	Find precise map location of 95.193.109.84
141.71.76.247	Find precise map location of 141.71.76.247
57.39.17.175	Find precise map location of 57.39.17.175
129.28.132.140	Find precise map location of 129.28.132.140
217.204.54.153	Find precise map location of 217.204.54.153
253.101.53.188	Find precise map location of 253.101.53.188
59.29.232.220	Find precise map location of 59.29.232.220
248.9.216.64	Find precise map location of 248.9.216.64

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