Robtex

Up: 191.253.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 191.253.72.0/22
Down right: 191.253.76.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
191.253.72.67	A+PTR	www.futurusnet.com.br
191.253.72.68	PTR	mail.futurusnet.com.br
191.253.72.68	A	brma.futurusnet.com.br
191.253.72.68	A	pochmann.com.br
191.253.72.254	A+PTR	191.253.72.254.futurusnet.com.br