216.164.21 is a class C of IPs

Sample IPs from the class C 216.164.21

216.164.21.90	View precise location of 216.164.21.90 on the map!
216.164.21.210	View precise location of 216.164.21.210 on the map!
216.164.21.12	View precise location of 216.164.21.12 on the map!
216.164.21.147	View precise location of 216.164.21.147 on the map!
216.164.21.64	View precise location of 216.164.21.64 on the map!
216.164.21.122	View precise location of 216.164.21.122 on the map!
216.164.21.229	View precise location of 216.164.21.229 on the map!
216.164.21.51	View precise location of 216.164.21.51 on the map!
216.164.21.222	View precise location of 216.164.21.222 on the map!
216.164.21.230	View precise location of 216.164.21.230 on the map!
216.164.21.3	View precise location of 216.164.21.3 on the map!

10 Random IPs

236.137.247.26	Find precise map location of 236.137.247.26
197.213.2.44	Find precise map location of 197.213.2.44
173.153.33.96	Find precise map location of 173.153.33.96
133.243.236.7	Find precise map location of 133.243.236.7
81.252.63.38	Find precise map location of 81.252.63.38
113.206.135.65	Find precise map location of 113.206.135.65
194.204.118.80	Find precise map location of 194.204.118.80
162.10.252.240	Find precise map location of 162.10.252.240
170.222.65.110	Find precise map location of 170.222.65.110
115.142.143.171	Find precise map location of 115.142.143.171
11.199.236.61	Find precise map location of 11.199.236.61

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