121.206.21 is a class C of IPs

Sample IPs from the class C 121.206.21

121.206.21.179	View precise location of 121.206.21.179 on the map!
121.206.21.9	View precise location of 121.206.21.9 on the map!
121.206.21.186	View precise location of 121.206.21.186 on the map!
121.206.21.35	View precise location of 121.206.21.35 on the map!
121.206.21.53	View precise location of 121.206.21.53 on the map!
121.206.21.137	View precise location of 121.206.21.137 on the map!
121.206.21.228	View precise location of 121.206.21.228 on the map!
121.206.21.249	View precise location of 121.206.21.249 on the map!
121.206.21.35	View precise location of 121.206.21.35 on the map!
121.206.21.92	View precise location of 121.206.21.92 on the map!
121.206.21.113	View precise location of 121.206.21.113 on the map!

10 Random IPs

13.76.13.196	Find precise map location of 13.76.13.196
253.46.6.231	Find precise map location of 253.46.6.231
239.241.135.171	Find precise map location of 239.241.135.171
58.20.59.239	Find precise map location of 58.20.59.239
189.94.53.5	Find precise map location of 189.94.53.5
252.222.231.223	Find precise map location of 252.222.231.223
135.231.180.146	Find precise map location of 135.231.180.146
159.23.241.10	Find precise map location of 159.23.241.10
215.8.35.14	Find precise map location of 215.8.35.14
243.73.200.90	Find precise map location of 243.73.200.90
4.18.89.52	Find precise map location of 4.18.89.52

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