Robtex

Up: 45.234.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 45.234.36.0/23
Down right: 45.234.38.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
45.234.36.5	PTR	mail.rb7telecom.com.br
45.234.36.5	PTR	web.rb7telecom.com.br
45.234.36.5	A	www.rb7telecom.com.br
45.234.36.6	A	isp1.rb7telecom.com.br
45.234.36.10	A	ns1.rb7telecom.com.br
45.234.36.14	A	ns2.rb7telecom.com.br