Robtex

Up: 200.23.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 200.23.68.0/23
Down right: 200.23.70.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
200.23.68.2	A+PTR	slavedns.egtech.com.br
200.23.68.2	A	email.egtech.com.br
200.23.68.2	A	mail.egtech.com.br
200.23.68.3	PTR	slavedns.egtech.com.br
200.23.71.11	A	br200.catlog.com.br
200.23.71.255	PTR	200.23.71.255.egtech.com.br