Robtex

Up: 157.240.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 157.240.20.0/25
Down right: 157.240.20.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
157.240.20.1	A+PTR	edge-services-shv-02-frt3.facebook.com
157.240.20.2	A+PTR	edge-resolver002-bgp-02-frt3.facebook.com
157.240.20.4	A+PTR	livestream-edgetee-upload-shv-02-frt3.facebook.com
157.240.20.4	A	edgetee-upload-frt3-2.xx.fbcdn.net
157.240.20.4	A	edgetee-upload-frt.xx.fbcdn.net
157.240.20.5	A+PTR	edge-atlas-shv-02-frt3.facebook.com
157.240.20.6	A+PTR	edge-stun-shv-02-frt3.facebook.com
157.240.20.7	A+PTR	edge-extern-shv-02-frt3.facebook.com
157.240.20.8	A+PTR	edge-latest-shv-02-frt3.facebook.com
157.240.20.10	A+PTR	edge-mqtt-shv-02-frt3.facebook.com
157.240.20.11	A+PTR	edge-mqtt-latest-shv-02-frt3.facebook.com
157.240.20.12	A+PTR	edge-secure-shv-02-frt3.facebook.com
157.240.20.15	A+PTR	edge-star-shv-02-frt3.facebook.com
157.240.20.15	A	ffbymale.com
157.240.20.15	A	star.fallback.c10r.facebook.com
157.240.20.16	A+PTR	edge-video-shv-02-frt3.fbcdn.net
157.240.20.16	A	video-a-frt.xx.fbcdn.net
157.240.20.16	A	video-frt3-2.xx.fbcdn.net
157.240.20.18	A+PTR	secure-edge-latest-shv-02-frt3.facebook.com
157.240.20.19	PTR	xx-fbcdn-shv-02-frt3.fbcdn.net
157.240.20.19	A	scontent.xx.fbcdn.net
157.240.20.19	A	f01a7842d80kdno4pyq-imrtmang1501842230-sonar.xz.fbcdn.net
157.240.20.24	A+PTR	livestream-fblive-dev-upload-shv-02-frt3.facebook.com
157.240.20.32	A+PTR	edge-mqtt-mini-shv-02-frt3.facebook.com
157.240.20.33	A+PTR	edge-snaptu-http-mini-shv-02-frt3.facebook.com
157.240.20.34	PTR	edge-sonar-mini-shv-02-frt3.fbcdn.net
157.240.20.34	A	fec09e8c980kyoji6qy-pcpftcnj1525850925-sonar.xz.fbcdn.net
157.240.20.34	A	f8cfde82080-dwgojewi1549479568-sonar.xz.fbcdn.net
157.240.20.35	A+PTR	edge-star-mini-shv-02-frt3.facebook.com
157.240.20.36	A+PTR	edge-z-m-mini-shv-02-frt3.facebook.com
157.240.20.36	A	z-m-scontent-frt.xx.fbcdn.net
157.240.20.37	A+PTR	instagram-p15-shv-02-frt3.fbcdn.net
157.240.20.38	A	edge-star-z-mini-shv-02-frt3.facebook.com
157.240.20.38	A	z-m-scontent-frt3-2.xx.fbcdn.net
157.240.20.39	A+PTR	iorg-fba-edge-shv-02-frt3.facebook.com
157.240.20.41	A+PTR	edge-z-1-p2-shv-02-frt3.facebook.com
157.240.20.41	A	z-1-scontent-frt3-2.xx.fbcdn.net
157.240.20.48	PTR	edge-turnservice-shv-02-frt3.facebook.com
157.240.20.50	A+PTR	edge-z-p3-shv-02-frt3.facebook.com
157.240.20.50	A	z-p3-scontent-frt3-2.xx.fbcdn.net
157.240.20.51	A+PTR	edgeray-shv-02-frt3.facebook.com
157.240.20.52	A+PTR	whatsapp-cdn-shv-02-frt3.fbcdn.net
157.240.20.52	A	media-frt3-2.cdn.whatsapp.net
157.240.20.52	A	w7ef4a7d91ksthfxnc-ge3dkmzyge4tmnby.snr.whatsapp.net
157.240.20.53	A+PTR	whatsapp-chatd-edge-shv-02-frt3.facebook.com
157.240.20.63	A+PTR	instagram-p3-shv-02-frt3.fbcdn.net
157.240.20.63	A	scontent-frt.cdninstagram.com
157.240.20.63	A	scontent-frt3-2.cdninstagram.com
157.240.20.169	A+PTR	edge-z-p4-shv-02-frt3.facebook.com
157.240.20.169	A	z-p4-scontent-frt3-2.xx.fbcdn.net
157.240.20.172	A+PTR	instagram-p4-shv-02-frt3.fbcdn.net
157.240.20.172	A	z-p4-scontent-frt3-2.cdninstagram.com
157.240.20.174	A+PTR	instagram-p42-shv-02-frt3.fbcdn.net
157.240.20.174	A	z-p42-scontent-frt3-2.cdninstagram.com
157.240.20.174	A	z-p42-instagram.c10r.instagram.com
157.240.20.194	A+PTR	traceroute-fbonly-bgp-02-frt3.facebook.com