Robtex

Up: 177.193.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 177.193.56.0/22
Down right: 177.193.60.0/22

IP	Type	Hostname
177.193.58.64	PTR	b1c13a40.virtua.com.br
177.193.58.129	PTR	b1c13a81.virtua.com.br
177.193.61.34	PTR	b1c13d22.virtua.com.br
177.193.61.154	PTR	b1c13d9a.virtua.com.br
177.193.62.89	PTR	b1c13e59.virtua.com.br