Robtex

Up: 66.231.94.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 66.231.94.0/26
Down right: 66.231.94.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.231.94.12	PTR	ftp.qa.exacttarget.com
66.231.94.15	PTR	etappx.qa.exacttarget.com
66.231.94.17	A+PTR	auth.boa.exacttarget.com
66.231.94.21	PTR	internal.test.exacttarget.com
66.231.94.22	A+PTR	image.test.exacttarget.com
66.231.94.23	A	cl.test.exacttarget.com
66.231.94.27	A+PTR	reply.test.exacttarget.com
66.231.94.27	A	reply.qa1.exacttarget.com
66.231.94.50	A+PTR	info4.accountonline.com
66.231.94.51	A+PTR	info4.searscard.com
66.231.94.52	A+PTR	info9.citibank.com
66.231.94.54	PTR	ftps.s4.exacttarget.com
66.231.94.55	PTR	click.dc2.reliantemail.com
66.231.94.57	A+PTR	app.s4.exct.net
66.231.94.80	A+PTR	pages.s4.exacttarget.com
66.231.94.84	A+PTR	imh.test.exacttarget.com
66.231.94.85	PTR	click.exacttarget.com
66.231.94.89	PTR	gadget.test.exacttarget.com
66.231.94.93	PTR	pages.email.argos.co.uk
66.231.94.93	A	www.argosemails.co.uk
66.231.94.93	A	argosemails.co.uk
66.231.94.100	A+PTR	safehouse.exacttarget.com
66.231.94.102	PTR	bounce.s4.exacttarget.com
66.231.94.103	A	bounce-mx.s5.exacttarget.com
66.231.94.104	PTR	cl.s4.exct.net
66.231.94.105	PTR	click.virt.s4.exacttarget.com
66.231.94.105	A	click.results.equinox.com
66.231.94.105	A	click.directdigitalmailing.com
66.231.94.106	A+PTR	ftp.s4.exacttarget.com
66.231.94.111	PTR	pages.virt.s4.exacttarget.com
66.231.94.111	A	pages.e.lowes.com
66.231.94.111	A	pages.onlinebillpay-email.com
66.231.94.112	PTR	reply.s4.exacttarget.com
66.231.94.115	PTR	view.virt.s4.exacttarget.com
66.231.94.115	A	view.rogersb2bmedia-newsletters.com
66.231.94.115	A	view.news.marksandspencer.com
66.231.94.116	A+PTR	webservice.s4.exacttarget.com
66.231.94.122	A+PTR	www.cotweet.com
66.231.94.122	A	blog.cotweet.com