Robtex

Up: 187.0.128.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 187.0.128.0/25
Down right: 187.0.128.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
187.0.128.1	A	router.win.net.br
187.0.128.3	PTR	mail.win.net.br
187.0.128.3	A	pektelecom.com
187.0.128.3	A	win.psi.br
187.0.128.15	A+PTR	ns2.win.psi.br
187.0.128.15	A	ns2.pektelecom.com
187.0.128.15	A	dns2.win.psi.br