143.66.109 is a class C of IPs

Sample IPs from the class C 143.66.109

143.66.109.20	View precise location of 143.66.109.20 on the map!
143.66.109.117	View precise location of 143.66.109.117 on the map!
143.66.109.234	View precise location of 143.66.109.234 on the map!
143.66.109.3	View precise location of 143.66.109.3 on the map!
143.66.109.206	View precise location of 143.66.109.206 on the map!
143.66.109.4	View precise location of 143.66.109.4 on the map!
143.66.109.151	View precise location of 143.66.109.151 on the map!
143.66.109.164	View precise location of 143.66.109.164 on the map!
143.66.109.220	View precise location of 143.66.109.220 on the map!
143.66.109.159	View precise location of 143.66.109.159 on the map!
143.66.109.84	View precise location of 143.66.109.84 on the map!

10 Random IPs

16.173.77.20	Find precise map location of 16.173.77.20
166.51.121.69	Find precise map location of 166.51.121.69
211.243.136.209	Find precise map location of 211.243.136.209
213.131.124.212	Find precise map location of 213.131.124.212
56.235.17.127	Find precise map location of 56.235.17.127
255.50.232.185	Find precise map location of 255.50.232.185
9.48.61.147	Find precise map location of 9.48.61.147
72.138.255.128	Find precise map location of 72.138.255.128
55.145.168.242	Find precise map location of 55.145.168.242
74.154.144.33	Find precise map location of 74.154.144.33
8.186.218.105	Find precise map location of 8.186.218.105

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