143.142.121 is a class C of IPs

Sample IPs from the class C 143.142.121

143.142.121.151	View precise location of 143.142.121.151 on the map!
143.142.121.152	View precise location of 143.142.121.152 on the map!
143.142.121.6	View precise location of 143.142.121.6 on the map!
143.142.121.32	View precise location of 143.142.121.32 on the map!
143.142.121.21	View precise location of 143.142.121.21 on the map!
143.142.121.9	View precise location of 143.142.121.9 on the map!
143.142.121.194	View precise location of 143.142.121.194 on the map!
143.142.121.245	View precise location of 143.142.121.245 on the map!
143.142.121.177	View precise location of 143.142.121.177 on the map!
143.142.121.89	View precise location of 143.142.121.89 on the map!
143.142.121.184	View precise location of 143.142.121.184 on the map!

10 Random IPs

66.6.188.64	Find precise map location of 66.6.188.64
104.195.83.72	Find precise map location of 104.195.83.72
196.136.108.32	Find precise map location of 196.136.108.32
65.35.247.175	Find precise map location of 65.35.247.175
102.128.65.142	Find precise map location of 102.128.65.142
196.255.71.195	Find precise map location of 196.255.71.195
123.160.7.94	Find precise map location of 123.160.7.94
56.130.104.213	Find precise map location of 56.130.104.213
72.77.67.88	Find precise map location of 72.77.67.88
140.224.222.82	Find precise map location of 140.224.222.82
53.74.144.131	Find precise map location of 53.74.144.131

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