Robtex

Up: 131.253.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 131.253.40.0/22
Down right: 131.253.44.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
131.253.40.1	A	ch1d.origin.bing.com
131.253.40.1	A	origin.ch1d.bing.com
131.253.40.1	A	37.city
131.253.40.4	PTR	t0.tip.tiles.live-int.com
131.253.40.10	A+PTR	toolbar-prod-ch1d.search.live.com
131.253.40.10	A	toolbar.search.msn.com.akadns.net
131.253.40.12	A+PTR	ch1.agent.services.microsoft.com
131.253.40.15	A	feeds.adcenter.microsoft.com
131.253.40.16	A	prodcashbackftp.bing.glbdns2.microsoft.com
131.253.40.39	A+PTR	vnext.ampam.msn.com
131.253.40.39	A	ampam.msn.com
131.253.40.40	A+PTR	pilot.agent.services.microsoft.com
131.253.40.44	A	aidps.msn.com
131.253.40.44	A	aidps.msn.com.nsatc.net
131.253.40.45	A	s.msn.com.nsatc.net
131.253.40.48	A	cm.adc.glbdns2.microsoft.com
131.253.40.49	A	h.atdmt.com.nsatc.net
131.253.40.50	A	c.9now.com.au
131.253.40.50	A	c.msn.co.jp.nsatc.net
131.253.40.51	PTR	next.m.bingads.microsoft.com
131.253.40.58	A+PTR	appfeedback.ms
131.253.40.60	A	data.choice.microsoft.com
131.253.40.64	A	analytics.msn.com.nsatc.net
131.253.40.64	A	analytics.atdmt.com
131.253.40.64	A	analytics.atdmt.com.nsatc.net
131.253.40.69	PTR	amer-prime-sports.msn-int.com
131.253.40.70	PTR	amer-prime-social.msn-int.com
131.253.40.73	A	auth.wifi.windows.com.akadns.net
131.253.40.74	A	app.maps.live.com
131.253.40.74	A	app.maps.glbdns2.microsoft.com
131.253.40.74	A	redirect.local.live.com
131.253.40.80	A	video.widgets.glbdns.microsoft.com
131.253.40.80	A	widgets.video.msn.com
131.253.40.107	A	beta.apprep.smartscreen.microsoft.com
131.253.40.107	A	w.apprep.smartscreen.microsoft.com
131.253.40.107	A	apprep.smartscreen.microsoft.com.nsatc.net
131.253.40.108	A	global.m.bing.com
131.253.40.112	A	catalog.photos.msn.com
131.253.40.112	A	catalog.photo.glbdns.microsoft.com
131.253.40.116	A	catalog-video-gtmv1.trafficmanager.net
131.253.40.116	A	catalog.video.glbdns.microsoft.com
131.253.40.124	A	devportal.maps.glbdns2.microsoft.com
131.253.40.151	A	ba59zw.bay.livefilestore.com
131.253.40.151	A	5nuvxg.sn2.livefilestore.com
131.253.40.155	A	mercury.microsoft.com
131.253.46.1	A	msnbot-131-253-46-136.search.msn.com
131.253.46.18	PTR	msnbot-131-253-46-18.search.msn.com
131.253.46.114	A+PTR	msnbot-131-253-46-114.search.msn.com
131.253.46.136	A	msnbot-131-253-46-136.search.msn.com
131.253.46.138	PTR	msnbot-131-253-46-138.search.msn.com
131.253.46.208	PTR	msnbot-131-253-46-208.search.msn.com
131.253.46.226	PTR	msnbot-131-253-46-226.search.msn.com
131.253.46.233	PTR	msnbot-131-253-46-233.search.msn.com
131.253.46.240	PTR	msnbot-131-253-46-240.search.msn.com
131.253.47.155	PTR	msnbot-131-253-47-155.search.msn.com
131.253.47.187	PTR	msnbot-131-253-47-187.search.msn.com
131.253.47.210	PTR	msnbot-131-253-47-210.search.msn.com