121.83.13 is a class C of IPs

Sample IPs from the class C 121.83.13

121.83.13.218	View precise location of 121.83.13.218 on the map!
121.83.13.2	View precise location of 121.83.13.2 on the map!
121.83.13.46	View precise location of 121.83.13.46 on the map!
121.83.13.97	View precise location of 121.83.13.97 on the map!
121.83.13.133	View precise location of 121.83.13.133 on the map!
121.83.13.31	View precise location of 121.83.13.31 on the map!
121.83.13.141	View precise location of 121.83.13.141 on the map!
121.83.13.134	View precise location of 121.83.13.134 on the map!
121.83.13.232	View precise location of 121.83.13.232 on the map!
121.83.13.114	View precise location of 121.83.13.114 on the map!
121.83.13.128	View precise location of 121.83.13.128 on the map!

10 Random IPs

88.240.125.83	Find precise map location of 88.240.125.83
163.86.9.73	Find precise map location of 163.86.9.73
179.57.26.148	Find precise map location of 179.57.26.148
171.241.180.133	Find precise map location of 171.241.180.133
118.173.83.74	Find precise map location of 118.173.83.74
34.83.206.209	Find precise map location of 34.83.206.209
231.215.128.204	Find precise map location of 231.215.128.204
122.7.63.176	Find precise map location of 122.7.63.176
46.61.49.94	Find precise map location of 46.61.49.94
214.24.44.188	Find precise map location of 214.24.44.188
196.84.19.221	Find precise map location of 196.84.19.221

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