Robtex

Up: 207.230.144.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 207.230.144.0/25
Down right: 207.230.144.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
207.230.144.18	A	ns1.clearchannel.com
207.230.144.18	A	ns1.lob-hosting.com
207.230.144.19	PTR	ns2.iheartmedia.com
207.230.144.19	A	ns2.clearchannel.com
207.230.144.19	A	ns2.lob-hosting.com
207.230.144.101	A+PTR	entmail.clearchannel.com
207.230.144.101	PTR	ccient6sat.entmail.clearchannel.com
207.230.144.240	PTR	nat.clearchannel.com
207.230.144.243	PTR	rly01.clearchannel.com
207.230.144.243	PTR	rly02.clearchannel.com
207.230.144.243	PTR	rly03.clearchannel.com
207.230.144.244	A+PTR	rly09.clearchannel.com
207.230.144.244	A+PTR	rly10.clearchannel.com
207.230.144.244	A+PTR	rly20.clearchannel.com