Robtex

Up: 66.225.224.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.225.225.0/25
Down right: 66.225.225.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.225.225.9	PTR	unknown.ord.scnet.net
66.225.225.22	PTR	unknown.ord.scnet.net
66.225.225.66	PTR	servercentral.il.us.quakenet.org
66.225.225.66	A	irc.dewetha.co.uk
66.225.225.66	A	mediatraffic2.fi.quakenet.org
66.225.225.96	PTR	unknown.ord.scnet.net
66.225.225.97	PTR	unknown.ord.scnet.net
66.225.225.99	PTR	unknown.ord.scnet.net
66.225.225.99	A	irc.serious.biz
66.225.225.112	PTR	unknown.ord.scnet.net
66.225.225.224	A+PTR	proxyscanner.irc.servercentral.net
66.225.225.225	PTR	irc.servercentral.net
66.225.225.225	A	irc.efnet.info
66.225.225.225	A	efnet.cs.hut.fi
66.225.225.239	PTR	unknown.ord.scnet.net