Robtex

Up: 31.13.96.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 31.13.112.0/21
Down right: 31.13.120.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.13.112.1	A	en-gb.ja-jp.inyour.facebook.com
31.13.112.1	A	ja-jp.tr-tr.inyour.facebook.com
31.13.112.1	A	zh-tw.nl-nl.inyour.facebook.com
31.13.113.140	A+PTR	origincache-shv-05-lla2.fbcdn.net
31.13.113.141	PTR	atlas-shv-05-lla2.facebook.com
31.13.113.141	A	atlas.vvv.facebook.com
31.13.113.142	A	snaptu-da-shv-05-lla2.facebook.com
31.13.113.143	A	snaptu-za-shv-05-lla2.facebook.com
31.13.113.144	A+PTR	vip31-13-113-144.dns.tfbnw.net
31.13.113.144	A	origincache-lla.t.fbcdn.net
31.13.113.145	A	snaptu-service-proxy-shv-05-lla2.facebook.com
31.13.113.209	A	snaptu-za-shv-07-lla2.facebook.com
31.13.113.210	A	snaptu-d-shv-07-lla2.facebook.com
31.13.114.16	A	origincache-lla.t.fbcdn.net
31.13.114.33	A+PTR	snaptu-za-shv-11-lla2.facebook.com
31.13.114.35	A	snaptu-service-proxy-shv-11-lla2.facebook.com
31.13.114.39	A	iorg-fba-shv-11-lla2.facebook.com
31.13.114.192	A	origincache-lla.t.fbcdn.net
31.13.115.1	A+PTR	fwdproxy-lla-001.fbsv.net
31.13.115.2	A+PTR	fwdproxy-lla-002.fbsv.net
31.13.115.3	A+PTR	fwdproxy-lla-003.fbsv.net
31.13.115.4	A	fwdproxy-lla-004.fbsv.net
31.13.115.16	A+PTR	fwdproxy-lla-016.fbsv.net
31.13.115.17	A+PTR	fwdproxy-lla-017.fbsv.net
31.13.115.18	A	fwdproxy-lla-018.fbsv.net
31.13.115.19	A+PTR	fwdproxy-lla-019.fbsv.net
31.13.115.114	A+PTR	fwdproxy-lla-114.fbsv.net
31.13.115.120	PTR	fwdproxy-lla-120.fbsv.net
31.13.115.250	A	origincache-lla.t.fbcdn.net
31.13.122.16	A+PTR	vip31-13-122-16.dns.tfbnw.net
31.13.124.64	A	origincache-cln.t.fbcdn.net
31.13.124.64	A	origincache-shv-04-cln1.fbcdn.net
31.13.125.1	A	origincache-cln.t.fbcdn.net
31.13.127.1	A	fwdproxy-cln-001.fbsv.net
31.13.127.2	A	fwdproxy-cln-002.fbsv.net
31.13.127.3	A	fwdproxy-cln-003.fbsv.net
31.13.127.4	A	fwdproxy-cln-004.fbsv.net
31.13.127.16	A	fwdproxy-cln-016.fbsv.net
31.13.127.17	A+PTR	fwdproxy-cln-017.fbsv.net
31.13.127.18	A	fwdproxy-cln-018.fbsv.net
31.13.127.19	A	fwdproxy-cln-019.fbsv.net
31.13.127.33	PTR	fwdproxy-cln-033.fbsv.net
31.13.127.117	PTR	fwdproxy-cln-117.fbsv.net
31.13.127.118	PTR	fwdproxy-cln-118.fbsv.net