Robtex

Up: 177.35.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.35.28.0/23
Down right: 177.35.30.0/23

IP	Type	Hostname
177.35.28.20	PTR	b1231c14.virtua.com.br
177.35.28.42	PTR	b1231c2a.virtua.com.br
177.35.29.74	PTR	b1231d4a.virtua.com.br
177.35.30.41	PTR	b1231e29.virtua.com.br
177.35.30.114	PTR	b1231e72.virtua.com.br