231.157.20 is a class C of IPs

Sample IPs from the class C 231.157.20

231.157.20.6	View precise location of 231.157.20.6 on the map!
231.157.20.190	View precise location of 231.157.20.190 on the map!
231.157.20.21	View precise location of 231.157.20.21 on the map!
231.157.20.124	View precise location of 231.157.20.124 on the map!
231.157.20.91	View precise location of 231.157.20.91 on the map!
231.157.20.213	View precise location of 231.157.20.213 on the map!
231.157.20.212	View precise location of 231.157.20.212 on the map!
231.157.20.192	View precise location of 231.157.20.192 on the map!
231.157.20.95	View precise location of 231.157.20.95 on the map!
231.157.20.130	View precise location of 231.157.20.130 on the map!
231.157.20.250	View precise location of 231.157.20.250 on the map!

10 Random IPs

222.38.184.130	Find precise map location of 222.38.184.130
29.21.44.204	Find precise map location of 29.21.44.204
122.151.177.214	Find precise map location of 122.151.177.214
51.198.26.77	Find precise map location of 51.198.26.77
6.181.153.84	Find precise map location of 6.181.153.84
68.22.141.60	Find precise map location of 68.22.141.60
207.28.84.53	Find precise map location of 207.28.84.53
136.150.128.85	Find precise map location of 136.150.128.85
214.130.206.163	Find precise map location of 214.130.206.163
142.69.52.89	Find precise map location of 142.69.52.89
29.103.176.66	Find precise map location of 29.103.176.66

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