Robtex

Up: 186.206.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 186.206.32.0/20
Down right: 186.206.48.0/20

IP	Type	Hostname
186.206.36.1	PTR	bace2401.virtua.com.br
186.206.38.34	PTR	bace2622.virtua.com.br
186.206.41.163	PTR	bace29a3.virtua.com.br
186.206.50.156	PTR	bace329c.virtua.com.br
186.206.51.162	PTR	bace33a2.virtua.com.br