Robtex

Up: 177.52.172.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 177.52.172.0/25
Down right: 177.52.172.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
177.52.172.80	PTR	www.unimedvr.com.br
177.52.172.80	PTR	cooperado.unimedvr.com.br
177.52.172.80	A+PTR	unimedvr.com.br
177.52.172.81	PTR	webmail.unimedvr.com.br
177.52.172.83	A+PTR	ns1.unimedvr.com.br
177.52.172.84	A+PTR	ns2.unimedvr.com.br