15.66.28 is a class C of IPs

Sample IPs from the class C 15.66.28

15.66.28.201	View precise location of 15.66.28.201 on the map!
15.66.28.150	View precise location of 15.66.28.150 on the map!
15.66.28.248	View precise location of 15.66.28.248 on the map!
15.66.28.145	View precise location of 15.66.28.145 on the map!
15.66.28.229	View precise location of 15.66.28.229 on the map!
15.66.28.27	View precise location of 15.66.28.27 on the map!
15.66.28.154	View precise location of 15.66.28.154 on the map!
15.66.28.92	View precise location of 15.66.28.92 on the map!
15.66.28.42	View precise location of 15.66.28.42 on the map!
15.66.28.105	View precise location of 15.66.28.105 on the map!
15.66.28.173	View precise location of 15.66.28.173 on the map!

10 Random IPs

164.206.192.112	Find precise map location of 164.206.192.112
189.226.146.17	Find precise map location of 189.226.146.17
103.202.175.27	Find precise map location of 103.202.175.27
239.87.36.17	Find precise map location of 239.87.36.17
144.37.99.253	Find precise map location of 144.37.99.253
230.144.104.80	Find precise map location of 230.144.104.80
199.195.227.43	Find precise map location of 199.195.227.43
255.205.12.14	Find precise map location of 255.205.12.14
119.160.194.84	Find precise map location of 119.160.194.84
64.129.247.48	Find precise map location of 64.129.247.48
245.202.92.133	Find precise map location of 245.202.92.133

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