Robtex

Up: 191.36.216.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 191.36.216.0/23
Down right: 191.36.218.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
191.36.216.27	PTR	cliente_27.216.36.191.cpwinternet.net.br
191.36.216.27	A	ns1.cpwinternet.net.br
191.36.216.27	A	cpwinternet.net.br
191.36.216.28	A	ns2.cpwinternet.net.br
191.36.216.34	A	pop.cpwinternet.com.br
191.36.216.34	A	cpwinternet.com.br
191.36.216.34	A	ns1.cpwinternet.com.br
191.36.216.35	PTR	cliente_35.216.36.191.cpwinternet.net.br
191.36.217.72	PTR	cliente_72.217.36.191.cpwinternet.net.br
191.36.217.154	PTR	cliente_154.217.36.191.cpwinternet.net.br
191.36.219.198	PTR	cliente_198.219.36.191.cpwinternet.net.br