143.205.21 is a class C of IPs

Sample IPs from the class C 143.205.21

143.205.21.234	View precise location of 143.205.21.234 on the map!
143.205.21.246	View precise location of 143.205.21.246 on the map!
143.205.21.128	View precise location of 143.205.21.128 on the map!
143.205.21.54	View precise location of 143.205.21.54 on the map!
143.205.21.177	View precise location of 143.205.21.177 on the map!
143.205.21.93	View precise location of 143.205.21.93 on the map!
143.205.21.186	View precise location of 143.205.21.186 on the map!
143.205.21.175	View precise location of 143.205.21.175 on the map!
143.205.21.193	View precise location of 143.205.21.193 on the map!
143.205.21.201	View precise location of 143.205.21.201 on the map!
143.205.21.32	View precise location of 143.205.21.32 on the map!

10 Random IPs

246.161.206.202	Find precise map location of 246.161.206.202
169.8.174.235	Find precise map location of 169.8.174.235
167.95.184.176	Find precise map location of 167.95.184.176
49.12.59.84	Find precise map location of 49.12.59.84
58.211.71.1	Find precise map location of 58.211.71.1
58.118.36.79	Find precise map location of 58.118.36.79
164.146.31.31	Find precise map location of 164.146.31.31
123.70.2.218	Find precise map location of 123.70.2.218
82.128.52.105	Find precise map location of 82.128.52.105
83.168.237.162	Find precise map location of 83.168.237.162
184.234.66.177	Find precise map location of 184.234.66.177

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