Robtex

Up: 66.231.94.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.231.94.0/25
Down right: 66.231.94.128/25
(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
66.231.94.143	A	pd1.s1.qa2.exacttarget.com
66.231.94.154	A+PTR	pages.news.marksandspencer.com
66.231.94.155	PTR	mx-nv.exacttarget.com
66.231.94.155	A	reply-dr.global.exacttarget.com
66.231.94.161	A+PTR	webservice.boa.exacttarget.com
66.231.94.174	PTR	click.boa.exacttarget.com
66.231.94.174	A	click.leasing.bankofamerica.com
66.231.94.174	A	click.virt.s5.exacttarget.com
66.231.94.175	A+PTR	view.boa.exacttarget.com
66.231.94.175	A	view.virt.s5.exacttarget.com
66.231.94.175	A	view.gcibemail.bankofamerica.com
66.231.94.179	A+PTR	etapp.boa.exacttarget.com
66.231.94.179	A	e.s4.exct.net
66.231.94.180	A+PTR	abuse.boa.exacttarget.com
66.231.94.184	PTR	orionims.s4.exacttarget.com
66.231.94.184	A	s5.exct.net
66.231.94.187	PTR	app.qa.exct.net
66.231.94.187	A	es-responses-wonga.com
66.231.94.187	A	uk-responses-wonga.com
66.231.94.191	PTR	mashtest.qa.exacttarget.com
66.231.94.193	A	sharebuilderoffer.com
66.231.94.200	A	cl.boa.exct.net
66.231.94.204	A	pages.boa.exacttarget.com
66.231.94.206	A+PTR	ftp.groupon.exacttarget.com
66.231.94.211	A	login.s2.qa2.exacttarget.com
66.231.94.212	A	api.nv.marketingcloudapps.com
66.231.94.213	A	pages.emcom.bankofamerica.com
66.231.94.214	A+PTR	pages.klm-mail.com
66.231.94.219	A+PTR	gtm02.exacttarget.com
66.231.94.220	A+PTR	platform.exacttarget.com
66.231.94.220	A	emmapp.web.com
66.231.94.220	A	emmapp.register.com
66.231.94.221	PTR	email.ticketmaster.com
66.231.94.221	A	direct.livenation.com
66.231.94.221	A	tmclient.ticketmaster.com
66.231.94.222	A+PTR	ns2.exacttarget.com
66.231.94.222	A	b.ns.email.corporate.americangreetings.com
66.231.94.222	A	mail.naturaltherapypages.com.au
66.231.94.228	A	rest.s5.exacttarget.com