128.21.243 is a class C of IPs

Sample IPs from the class C 128.21.243

128.21.243.241	View precise location of 128.21.243.241 on the map!
128.21.243.82	View precise location of 128.21.243.82 on the map!
128.21.243.142	View precise location of 128.21.243.142 on the map!
128.21.243.130	View precise location of 128.21.243.130 on the map!
128.21.243.242	View precise location of 128.21.243.242 on the map!
128.21.243.169	View precise location of 128.21.243.169 on the map!
128.21.243.249	View precise location of 128.21.243.249 on the map!
128.21.243.57	View precise location of 128.21.243.57 on the map!
128.21.243.154	View precise location of 128.21.243.154 on the map!
128.21.243.211	View precise location of 128.21.243.211 on the map!
128.21.243.72	View precise location of 128.21.243.72 on the map!

10 Random IPs

26.76.239.18	Find precise map location of 26.76.239.18
63.200.187.118	Find precise map location of 63.200.187.118
198.48.116.186	Find precise map location of 198.48.116.186
172.68.100.129	Find precise map location of 172.68.100.129
74.247.216.171	Find precise map location of 74.247.216.171
104.179.250.102	Find precise map location of 104.179.250.102
151.39.149.177	Find precise map location of 151.39.149.177
169.233.65.15	Find precise map location of 169.233.65.15
16.202.94.72	Find precise map location of 16.202.94.72
110.116.169.236	Find precise map location of 110.116.169.236
210.2.159.2	Find precise map location of 210.2.159.2

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