Robtex

Up: 186.192.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 186.192.17.0/25
Down right: 186.192.17.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
186.192.17.8	A	ip186-192-17-8.cortezonline.com.br
186.192.17.140	PTR	cache.google.com
186.192.17.140	A	r1.sn-jvgux1cg-o5ue.c.android.clients.google.com
186.192.17.140	A	r1---sn-jvgux1cg-o5ue.gvt1.com
186.192.17.141	PTR	ip186-192-17-141.cortezonline.com.br
186.192.17.141	A	r2---sn-jvgux1cg-o5ue.gvt1.com
186.192.17.141	A	r2.sn-jvgux1cg-o5ue.gvt1.com
186.192.17.150	A+PTR	ip186-192-17-150.cortezonline.com.br
186.192.17.161	A	ip186-192-17-161.cortezonline.com.br
186.192.17.166	A+PTR	ip186-192-17-166.cortezonline.com.br
186.192.17.185	A	ip186-192-17-185.cortezonline.com.br
186.192.17.189	A	ip186-192-17-189.cortezonline.com.br
186.192.17.190	A	ip186-192-17-190.cortezonline.com.br