143.121.31 is a class C of IPs

Sample IPs from the class C 143.121.31

143.121.31.42	View precise location of 143.121.31.42 on the map!
143.121.31.76	View precise location of 143.121.31.76 on the map!
143.121.31.143	View precise location of 143.121.31.143 on the map!
143.121.31.114	View precise location of 143.121.31.114 on the map!
143.121.31.236	View precise location of 143.121.31.236 on the map!
143.121.31.220	View precise location of 143.121.31.220 on the map!
143.121.31.211	View precise location of 143.121.31.211 on the map!
143.121.31.62	View precise location of 143.121.31.62 on the map!
143.121.31.174	View precise location of 143.121.31.174 on the map!
143.121.31.175	View precise location of 143.121.31.175 on the map!
143.121.31.196	View precise location of 143.121.31.196 on the map!

10 Random IPs

171.240.222.64	Find precise map location of 171.240.222.64
71.146.211.44	Find precise map location of 71.146.211.44
235.90.211.176	Find precise map location of 235.90.211.176
32.46.159.123	Find precise map location of 32.46.159.123
147.68.212.101	Find precise map location of 147.68.212.101
32.150.5.183	Find precise map location of 32.150.5.183
171.29.200.113	Find precise map location of 171.29.200.113
99.50.94.184	Find precise map location of 99.50.94.184
106.181.182.16	Find precise map location of 106.181.182.16
13.197.184.185	Find precise map location of 13.197.184.185
17.45.82.60	Find precise map location of 17.45.82.60

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