Robtex

Up: 64.81.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 64.81.16.0/25
Down right: 64.81.16.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.81.16.69	A+PTR	dsl081-016-069.sfo1.dsl.speakeasy.net
64.81.16.69	A	nsna.warakorn.com
64.81.16.69	A	nsna.springtms.com
64.81.16.179	PTR	mail.asani.com
64.81.16.182	PTR	pc2.asani.com
64.81.16.186	PTR	dsl081-016-186.sfo1.dsl.speakeasy.net
64.81.16.186	A	tigerme.com
64.81.16.186	A	tigerme.org
64.81.16.255	A	brd081-016-000.dsl.speakeasy.net