Robtex

Up: 177.221.192.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.221.192.0/23
Down right: 177.221.194.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
177.221.194.10	A+PTR	ns1.w3nt.com
177.221.194.10	A	w3.net.br
177.221.194.10	A	w3nt-rev3.w3nt.com
177.221.194.83	PTR	imail2.w3nt.com
177.221.194.83	A	imap.megavelocidade.com.br
177.221.194.83	A	mail.w3nt.com
177.221.194.118	PTR	177-221-194-118.megavelocidade.com.br
177.221.194.118	A	frigorificoredentor.com.br