Robtex

Up: 69.171.252.0/22
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Down left: 69.171.254.0/24
Down right: 69.171.255.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
69.171.255.11	A	b.ns.xx.fbcdn.net
69.171.255.11	A	b.ns.xy.fbcdn.net
69.171.255.11	A	b.ns.cdn.whatsapp.net
69.171.255.12	A	b.ns.fbcdn.net
69.171.255.12	A	b.ns.thefacebook.com
69.171.255.12	A	xn--fiqs8s7zfhxek67b1uuwsj.com