Robtex

Up: 177.137.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.137.148.0/23
Down right: 177.137.150.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
177.137.148.35	PTR	177-137-148-35.ip.acentralnet.com.br
177.137.148.35	A	desafiodosestados.net
177.137.148.35	A	dedoduro.com.br
177.137.148.44	A	ns2.linux.mauritec.com.br
177.137.148.44	A	linux.mauritec.com.br
177.137.148.44	A	ns1.linux.mauritec.com.br
177.137.150.52	PTR	177-137-150-52.ip.mtnet.net.br
177.137.150.100	A+PTR	mail.infoeng.com.br