Robtex

Up: 143.208.136.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 143.208.136.0/24
Down right: 143.208.137.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
143.208.136.12	PTR	proserv.net.br
143.208.136.12	A	r1---sn-2gvnxg8oxu-5uhe.googlevideo.com
143.208.136.12	A	r1---sn-2gvnxg8oxu-5uhe.gvt1.com
143.208.136.13	PTR	proserv.net.br
143.208.137.179	PTR	proserv.net.br