Robtex

Up: 65.54.204.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 65.54.206.0/24
Down right: 65.54.207.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
65.54.206.11	A+PTR	tk5bumeda01.bosgfs.msft.net
65.54.206.30	PTR	officeaccess2007.org
65.54.206.30	PTR	officecommunicator.org
65.54.206.30	PTR	officeinfopath.net
65.54.206.33	A	a.officeupdate.microsoft.com
65.54.206.41	A	watson1.officeprep.microsoft.com
65.54.206.42	A+PTR	watson2.officeprep.microsoft.com
65.54.206.50	A	watson4.watson.microsoft.com
65.54.206.52	A	watson6.watson.microsoft.com
65.54.206.56	PTR	services.officebeta.microsoft.com
65.54.206.56	A+PTR	a.services.office.microsoft.com
65.54.206.58	PTR	config.officebeta.microsoft.com
65.54.206.58	A+PTR	a.r.office.microsoft.com
65.54.206.109	A+PTR	astro.msn.com
65.54.206.110	A+PTR	careersv4.msn.com
65.54.206.111	A+PTR	ideashappen.msn.com
65.54.206.113	PTR	msnkidz.com
65.54.206.113	PTR	msnkids.net
65.54.206.113	PTR	msnkidz.net
65.54.206.115	PTR	msnfilter.com
65.54.206.115	PTR	msnfilters.com
65.54.206.115	PTR	audioemoticons.msn.com
65.54.206.116	A+PTR	rsvote.msn.com
65.54.206.118	PTR	msnlatino.com
65.54.206.121	PTR	msn8.com
65.54.206.121	PTR	signuphelp.com
65.54.206.121	A+PTR	outlooklive.msn.com
65.54.206.125	A+PTR	hs.msn.com
65.54.206.126	A+PTR	channelscdf.msn.com
65.54.206.159	A+PTR	css1.webmessenger-live.live-int.com
65.54.206.159	A+PTR	css2.webmessenger-live.live-int.com
65.54.206.159	A+PTR	images1.webmessenger-live.live-int.com
65.54.207.19	A	uploadold.video.msn-int.com
65.54.207.79	PTR	uat.subscriptions.msdn.microsoft.com
65.54.207.247	A	join.msn-int.com