Robtex

Up: 204.245.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 204.245.64.0/19
Down right: 204.245.96.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.245.64.0	PTR	204-245-64-0.swnetworks.com
204.245.67.66	PTR	nmcwebsrvr.hearstnewmedia.com
204.245.86.2	PTR	barracuda.dalecarnegie.com
204.245.86.2	PTR	dale1.dalecarnegie.com
204.245.86.2	PTR	dale4.dalecarnegie.com
204.245.86.10	A+PTR	barracuda.dalecarnegie.com
204.245.86.10	A	barracuda.dale-carnegie.com
204.245.86.31	A	www.onlinedct.com
204.245.86.67	A+PTR	dale1.dalecarnegie.com
204.245.86.77	PTR	dalecarnegie.com
204.245.86.115	A+PTR	dale4.dalecarnegie.com
204.245.87.102	PTR	mail.marblegates.com
204.245.87.102	A	emailsecurity.marblegate.com
204.245.87.255	A+PTR	204-245-87-255.dia.static.qwest.net
204.245.106.129	PTR	204245106129.bellatlantic.net
204.245.106.131	PTR	204245106131.bellatlantic.net
204.245.106.192	PTR	204245106192.bellatlantic.net
204.245.107.1	PTR	2042451071.bellatlantic.net
204.245.107.65	PTR	20424510765.bellatlantic.net
204.245.111.2	A+PTR	webmail.paxtonmedia.com
204.245.111.2	A	paxtonmedia.com
204.245.111.2	A	mail.paxtonmedia.com
204.245.111.20	A	amp.paxtonmedia.com