143.121.216 is a class C of IPs

Sample IPs from the class C 143.121.216

143.121.216.101	View precise location of 143.121.216.101 on the map!
143.121.216.2	View precise location of 143.121.216.2 on the map!
143.121.216.1	View precise location of 143.121.216.1 on the map!
143.121.216.136	View precise location of 143.121.216.136 on the map!
143.121.216.64	View precise location of 143.121.216.64 on the map!
143.121.216.15	View precise location of 143.121.216.15 on the map!
143.121.216.188	View precise location of 143.121.216.188 on the map!
143.121.216.45	View precise location of 143.121.216.45 on the map!
143.121.216.56	View precise location of 143.121.216.56 on the map!
143.121.216.71	View precise location of 143.121.216.71 on the map!
143.121.216.16	View precise location of 143.121.216.16 on the map!

10 Random IPs

85.224.229.49	Find precise map location of 85.224.229.49
36.115.242.22	Find precise map location of 36.115.242.22
4.249.153.82	Find precise map location of 4.249.153.82
120.167.15.153	Find precise map location of 120.167.15.153
79.229.198.204	Find precise map location of 79.229.198.204
10.2.109.168	Find precise map location of 10.2.109.168
133.124.84.52	Find precise map location of 133.124.84.52
2.236.227.225	Find precise map location of 2.236.227.225
161.218.156.39	Find precise map location of 161.218.156.39
180.177.103.206	Find precise map location of 180.177.103.206
199.247.155.155	Find precise map location of 199.247.155.155

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