Robtex

Up: 177.193.240.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.193.244.0/23
Down right: 177.193.246.0/23

IP	Type	Hostname
177.193.244.65	PTR	b1c1f441.virtua.com.br
177.193.245.31	PTR	b1c1f51f.virtua.com.br
177.193.246.42	PTR	b1c1f62a.virtua.com.br
177.193.246.45	PTR	b1c1f62d.virtua.com.br
177.193.247.200	PTR	b1c1f7c8.virtua.com.br