143.221.28 is a class C of IPs

Sample IPs from the class C 143.221.28

143.221.28.112	View precise location of 143.221.28.112 on the map!
143.221.28.94	View precise location of 143.221.28.94 on the map!
143.221.28.5	View precise location of 143.221.28.5 on the map!
143.221.28.152	View precise location of 143.221.28.152 on the map!
143.221.28.39	View precise location of 143.221.28.39 on the map!
143.221.28.205	View precise location of 143.221.28.205 on the map!
143.221.28.184	View precise location of 143.221.28.184 on the map!
143.221.28.95	View precise location of 143.221.28.95 on the map!
143.221.28.1	View precise location of 143.221.28.1 on the map!
143.221.28.52	View precise location of 143.221.28.52 on the map!
143.221.28.164	View precise location of 143.221.28.164 on the map!

10 Random IPs

177.199.87.114	Find precise map location of 177.199.87.114
243.42.252.19	Find precise map location of 243.42.252.19
176.89.194.174	Find precise map location of 176.89.194.174
178.67.120.29	Find precise map location of 178.67.120.29
128.193.138.92	Find precise map location of 128.193.138.92
44.102.80.83	Find precise map location of 44.102.80.83
237.189.218.168	Find precise map location of 237.189.218.168
19.255.182.85	Find precise map location of 19.255.182.85
204.104.227.245	Find precise map location of 204.104.227.245
169.167.76.254	Find precise map location of 169.167.76.254
59.244.136.58	Find precise map location of 59.244.136.58

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