Robtex

Up: 177.35.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.35.140.0/23
Down right: 177.35.142.0/23

IP	Type	Hostname
177.35.140.14	PTR	b1238c0e.virtua.com.br
177.35.140.138	PTR	b1238c8a.virtua.com.br
177.35.140.198	PTR	b1238cc6.virtua.com.br
177.35.140.235	PTR	b1238ceb.virtua.com.br
177.35.141.183	PTR	b1238db7.virtua.com.br
177.35.141.195	PTR	b1238dc3.virtua.com.br
177.35.142.72	PTR	b1238e48.virtua.com.br
177.35.142.135	PTR	b1238e87.virtua.com.br
177.35.142.138	PTR	b1238e8a.virtua.com.br
177.35.143.134	PTR	b1238f86.virtua.com.br