Robtex

Up: 131.72.152.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 131.72.152.0/25
Down right: 131.72.152.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
131.72.152.0	PTR	131-72-152-0.host.nbstelecom.psi.br
131.72.152.34	A+PTR	nbstelecom.psi.br
131.72.152.34	A	nbstelecom.com.br
131.72.152.34	A	ns1.nbstelecom.psi.br
131.72.152.35	PTR	nbstelecom.psi.br
131.72.152.35	A	ns2.nbstelecom.psi.br