Robtex

Up: 199.201.64.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 199.201.65.0/25
Down right: 199.201.65.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.201.65.12	A+PTR	frc-osb-ext.thefacebook.com
199.201.65.14	PTR	frc-fs.sales.fb.com
199.201.65.15	A	frc-vsp.fb.com
199.201.65.16	A	frc-appstore.fb.com
199.201.65.18	A	frcvpn.thefacebook.com
199.201.65.19	A	frcvpn01.thefacebook.com
199.201.65.20	A	frcvpn02.thefacebook.com
199.201.65.22	A+PTR	irc-frc.tfbnw.net
199.201.65.22	A	irc3.tfbnw.net
199.201.65.22	A	irc.t.tfbnw.net
199.201.65.23	A	maileast.thefacebook.com
199.201.65.32	A	www.fbrep.com
199.201.65.32	A	fbrep.com
199.201.65.35	A+PTR	lb-frc-mirror-ext.thefacebook.com
199.201.65.35	A	mirror-ext.t.tfbnw.net
199.201.65.55	A	remoteassist-east.thefacebook.com
199.201.65.108	A	frcvpn03.thefacebook.com
199.201.65.109	A	frcvpn04.thefacebook.com