Robtex

Up: 208.84.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.84.0.0/23
Down right: 208.84.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.84.0.53	A+PTR	ns1.msft.net
208.84.0.53	A	ns1-205.msecnd.net.msft.info
208.84.0.53	A	absukltd.co.uk
208.84.2.53	PTR	ns2.msft.net
208.84.2.53	A	ns2-01.mono-for-android.net.msftnet.org
208.84.2.53	A	ns2-205.s-msn.com.msftnet.org