Robtex

Up: 189.28.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 189.28.192.0/20
Down right: 189.28.208.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
189.28.192.113	A+PTR	mx.adatel.com.br
189.28.192.113	A	mail.netsj.adatel.com.br
189.28.192.113	A	servidor.netsj.adatel.com.br
189.28.192.114	PTR	ns3.tvc.tv.br
189.28.192.115	PTR	ns4.tvc.tv.br
189.28.208.14	PTR	189-28-208-14-host.tvc.tv.br