16.21.12 is a class C of IPs

Sample IPs from the class C 16.21.12

16.21.12.121	View precise location of 16.21.12.121 on the map!
16.21.12.242	View precise location of 16.21.12.242 on the map!
16.21.12.88	View precise location of 16.21.12.88 on the map!
16.21.12.176	View precise location of 16.21.12.176 on the map!
16.21.12.197	View precise location of 16.21.12.197 on the map!
16.21.12.72	View precise location of 16.21.12.72 on the map!
16.21.12.213	View precise location of 16.21.12.213 on the map!
16.21.12.40	View precise location of 16.21.12.40 on the map!
16.21.12.245	View precise location of 16.21.12.245 on the map!
16.21.12.44	View precise location of 16.21.12.44 on the map!
16.21.12.198	View precise location of 16.21.12.198 on the map!

10 Random IPs

167.89.213.34	Find precise map location of 167.89.213.34
96.240.160.215	Find precise map location of 96.240.160.215
223.252.191.181	Find precise map location of 223.252.191.181
142.212.216.193	Find precise map location of 142.212.216.193
213.65.65.115	Find precise map location of 213.65.65.115
186.6.212.119	Find precise map location of 186.6.212.119
223.156.134.20	Find precise map location of 223.156.134.20
41.179.2.159	Find precise map location of 41.179.2.159
170.15.36.149	Find precise map location of 170.15.36.149
222.31.124.214	Find precise map location of 222.31.124.214
16.55.247.241	Find precise map location of 16.55.247.241

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