Robtex

Up: 31.13.65.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 31.13.65.128/26
Down right: 31.13.65.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.13.65.130	A+PTR	edge-cg-rtc-shv-01-atl3.facebook.com
31.13.65.169	A+PTR	edge-z-p4-shv-01-atl3.facebook.com
31.13.65.169	A	z-p4-scontent-atl3-1.xx.fbcdn.net
31.13.65.170	A+PTR	edge-mqtt-p4-shv-01-atl3.facebook.com
31.13.65.170	A	mqtt-p4.c10r.facebook.com
31.13.65.171	A	edge-snaptu-http-p4-shv-01-atl3.facebook.com
31.13.65.172	A+PTR	instagram-p4-shv-01-atl3.fbcdn.net
31.13.65.172	A	z-p4-instagram.c10r.facebook.com
31.13.65.172	A	z-p4-scontent.cdninstagram.com
31.13.65.173	A+PTR	edge-ig-mqtt-p4-shv-01-atl3.facebook.com
31.13.65.173	A	mqtt-ig-p4.c10r.facebook.com
31.13.65.174	A+PTR	instagram-p42-shv-01-atl3.fbcdn.net
31.13.65.174	A	z-p42-scontent.cdninstagram.com
31.13.65.174	A	z-p42-instagram.c10r.facebook.com
31.13.65.202	A	pushnotifs-pp-shv-01-atl3.facebook.com
31.13.65.203	A	fbpigeon-pp-shv-01-atl3.facebook.com
31.13.65.215	PTR	edge-onevc-sip-shv-01-atl3.facebook.com