Robtex

Up: 31.13.90.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.13.91.0/25
Down right: 31.13.91.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.13.91.1	A	edge-mqtt-shv-01-ams3.facebook.com
31.13.91.2	A	edge-star-shv-01-ams3.facebook.com
31.13.91.2	A	ru.facebookies.org
31.13.91.2	A	edge-star-ams3-1.xx.fbcdn.net
31.13.91.3	A	sxztkj.com
31.13.91.3	A	edge-cryptossl-shv-01-ams3.facebook.com
31.13.91.4	A+PTR	edge-z-m-shv-01-ams3.facebook.com
31.13.91.4	A	tls13.vvv.facebook.com
31.13.91.4	A	47767878.com
31.13.91.6	A	ff713a7c480kkcziu4y-tnthhvxx1468138854-sonar.xz.fbcdn.net
31.13.91.6	A	f03a072c480kgjdpsey-tyezhono1490651881-sonar.xz.fbcdn.net
31.13.91.6	A	f1ccb976a80kncmhtwy-undwyocz1496250491-sonar.xz.fbcdn.net
31.13.91.9	A	edge-atlas-shv-01-ams3.facebook.com
31.13.91.10	A	netprobe-bgp-01-ams3.facebook.com
31.13.91.11	A+PTR	edge-sonar-shv-01-ams3.fbcdn.net
31.13.91.12	A	363668888.com
31.13.91.12	A	sy6666.free.tx333.cc
31.13.91.13	A+PTR	edge-snaptu-http-p1-shv-01-ams3.facebook.com
31.13.91.15	A	video-a-ams.xx.fbcdn.net
31.13.91.15	A	video-b-ams.xx.fbcdn.net
31.13.91.15	A	edge-video-shv-01-ams3.fbcdn.net
31.13.91.16	A	livestream-edgetee-upload-shv-01-ams3.facebook.com
31.13.91.17	A	xn--11-sx2g23c.com
31.13.91.17	A	zhutangfacebook.com
31.13.91.17	A	55523c.com
31.13.91.19	A	edge-extern-shv-01-ams3.facebook.com
31.13.91.20	A	livestream-edgetee-shv-01-ams3.facebook.com
31.13.91.20	A	edgetee-ams3-1.xx.fbcdn.net
31.13.91.21	A	edge-z-p1-shv-01-ams3.facebook.com
31.13.91.23	A	edge-livestream-api-upload-shv-01-ams3.facebook.com
31.13.91.25	A+PTR	edge-resolver002-bgp-01-ams3.facebook.com
31.13.91.26	A	edge-resolver001-bgp-01-ams3.facebook.com
31.13.91.32	A	instagram-p15-shv-01-ams3.fbcdn.net
31.13.91.32	A	edge-z-mini-shv-01-ams3.facebook.com
31.13.91.33	A+PTR	edge-snaptu-http-mini-shv-01-ams3.facebook.com
31.13.91.34	A	edge-mqtt-mini-shv-01-ams3.facebook.com
31.13.91.35	A	ff713a7c480kkcziu4y-tnthhvxx1468138854-sonar.xz.fbcdn.net
31.13.91.35	A	ff0492bc180-dtjaaeli1541594075-sonar.xx.fbcdn.net
31.13.91.35	A	f1f6ecb9680knsvydii-ufscnhwi1517144737-sonar.xz.fbcdn.net
31.13.91.36	A	cupsulo.com
31.13.91.36	A	20057799.com
31.13.91.36	A	j1sc.com
31.13.91.37	A+PTR	edge-z-m-mini-shv-01-ams3.facebook.com
31.13.91.38	A	z-m-scontent-ams3-1.xx.fbcdn.net
31.13.91.38	A	z-m-scontent-ams.xx.fbcdn.net
31.13.91.38	A	edge-star-z-mini-shv-01-ams3.facebook.com
31.13.91.40	A	edge-z-1-p2-shv-01-ams3.facebook.com
31.13.91.40	A	z-1-video-ams3-1.xx.fbcdn.net
31.13.91.40	A	z-1-scontent-ams3-1.xx.fbcdn.net
31.13.91.41	A	edge-snaptu-http-p2-shv-01-ams3.facebook.com
31.13.91.48	A	edgeray-shv-01-ams3.facebook.com
31.13.91.49	A	whatsapp-chatd-edge-shv-01-ams3.facebook.com
31.13.91.51	A	w638914471khydpind-gm4tknbshe3damzu.snr.whatsapp.net
31.13.91.51	A	whatsapp-cdn-shv-01-ams3.fbcdn.net
31.13.91.51	A	wcb4027021knzfmygc-ge4damrrgqytgmbx.snr.whatsapp.net
31.13.91.52	A	instagram-p3-shv-01-ams3.fbcdn.net
31.13.91.52	A	scontent-ams.cdninstagram.com
31.13.91.52	A	scontent-ams3-1.cdninstagram.com
31.13.91.53	A	edge-z-p3-shv-01-ams3.facebook.com
31.13.91.53	A	z-p3-scontent-ams3-1.xx.fbcdn.net
31.13.91.53	A	z-p3-video-ams3-1.xx.fbcdn.net
31.13.91.54	A+PTR	edge-turnservice-shv-01-ams3.facebook.com
31.13.91.169	A+PTR	edge-z-p4-shv-01-ams3.facebook.com
31.13.91.169	A	z-p4-scontent-ams3-1.xx.fbcdn.net
31.13.91.172	A	instagram-p4-shv-01-ams3.fbcdn.net
31.13.91.172	A	z-p4-scontent-ams3-1.cdninstagram.com
31.13.91.173	A	edge-ig-mqtt-p4-shv-01-ams3.facebook.com
31.13.91.174	A+PTR	instagram-p42-shv-01-ams3.fbcdn.net
31.13.91.174	A	z-p42-scontent-ams3-1.cdninstagram.com