Robtex

Up: 157.240.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 157.240.12.0/25
Down right: 157.240.12.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
157.240.12.1	A+PTR	edge-services-shv-02-gru2.facebook.com
157.240.12.1	A	edgetee-gru2-2.xx.fbcdn.net
157.240.12.4	A+PTR	livestream-edgetee-upload-shv-02-gru2.facebook.com
157.240.12.4	A	edgetee-upload.xx.fbcdn.net
157.240.12.5	A+PTR	edge-atlas-shv-02-gru2.facebook.com
157.240.12.5	A	atlas.xx.fbcdn.net
157.240.12.5	A	atlas.c10r.facebook.com
157.240.12.6	PTR	edge-stun-shv-02-gru2.facebook.com
157.240.12.6	A	stun.c10r.facebook.com
157.240.12.7	A	edge-extern-shv-02-gru2.facebook.com
157.240.12.8	A+PTR	edge-msgr-latest-shv-02-gru2.facebook.com
157.240.12.8	A	msgr-latest.c10r.facebook.com
157.240.12.8	A	edge-livestream-api-upload-shv-02-gru2.facebook.com
157.240.12.9	A+PTR	edge-mqtt-shv-02-gru2.facebook.com
157.240.12.9	A	mqtt.c10r.facebook.com
157.240.12.10	A+PTR	edge-secure-shv-02-gru2.facebook.com
157.240.12.10	A	secure.c10r.facebook.com
157.240.12.11	A	edge-shortwave-shv-02-gru2.facebook.com
157.240.12.12	PTR	edge-snaptu-http-p1-shv-02-gru2.facebook.com
157.240.12.12	A	snaptu-p1.c10r.facebook.com
157.240.12.13	PTR	edge-star-shv-02-gru2.facebook.com
157.240.12.13	A	atlasin-stream.com
157.240.12.13	A	friendfeed-inc.com
157.240.12.14	PTR	edge-video-shv-02-gru2.fbcdn.net
157.240.12.14	A	video-a-gru.xx.fbcdn.net
157.240.12.14	A	video-gru2-2.xx.fbcdn.net
157.240.12.15	A	edge-z-p1-shv-02-gru2.facebook.com
157.240.12.16	PTR	xx-fbcdn-shv-02-gru2.fbcdn.net
157.240.12.16	A	f28d8696e80kdno4pyq-qxaglflv1502325678-sonar.xz.fbcdn.net
157.240.12.16	A	scontent.xx.fbcdn.net
157.240.12.19	PTR	edge-mqtt-latest-shv-02-gru2.facebook.com
157.240.12.19	A	mqtt-latest.c10r.facebook.com
157.240.12.25	A	fblive.c10r.facebook.com
157.240.12.26	A+PTR	intern-managed-client-shv-02-gru2.facebook.com
157.240.12.26	A	intern-managed-client.c10r.facebook.com
157.240.12.30	A	fbvp-staging.c10r.facebook.com
157.240.12.30	A	livestream-fbvp-edgetee-upload-shv-02-gru2.facebook.com
157.240.12.32	A+PTR	edge-mqtt-mini-shv-02-gru2.facebook.com
157.240.12.32	A	mqtt-mini.c10r.facebook.com
157.240.12.33	PTR	whatsapp-chatd-msgr-mini-edge-shv-02-gru2.facebook.com
157.240.12.33	A	snaptu-mini.c10r.facebook.com
157.240.12.33	A	edge-snaptu-http-mini-shv-02-gru2.facebook.com
157.240.12.34	PTR	edge-sonar-mini-shv-02-gru2.fbcdn.net
157.240.12.34	A	fa89a3d9680-hgyauecn1550816634-sonar.xx.fbcdn.net
157.240.12.34	A	fc3a57dbb80k2kgxaiq-zvbfdxem1495774997-sonar.xz.fbcdn.net
157.240.12.35	A+PTR	edge-star-mini-shv-02-gru2.facebook.com
157.240.12.35	A	fb.com
157.240.12.35	A	fbsbx.com
157.240.12.36	PTR	edge-z-m-mini-shv-02-gru2.facebook.com
157.240.12.36	A	senbit.com
157.240.12.36	A	internet.org
157.240.12.37	A+PTR	instagram-p15-shv-02-gru2.fbcdn.net
157.240.12.37	A	z-p15-scontent.cdninstagram.com
157.240.12.37	A	z-p15-instagram.c10r.facebook.com
157.240.12.38	PTR	edge-fblite-tcp-mini-shv-02-gru2.facebook.com
157.240.12.38	A	edge-star-z-mini-shv-02-gru2.facebook.com
157.240.12.38	A	z-m-scontent-gru.xx.fbcdn.net
157.240.12.39	A+PTR	iorg-fba-edge-shv-02-gru2.facebook.com
157.240.12.39	A	iorg-fba.c10r.facebook.com
157.240.12.40	A	edge-snaptu-http-p2-shv-02-gru2.facebook.com
157.240.12.41	A	edge-z-1-p2-shv-02-gru2.facebook.com
157.240.12.41	A	z-1-scontent-gru2-2.xx.fbcdn.net
157.240.12.41	A	z-1-video-gru2-2.xx.fbcdn.net
157.240.12.48	A+PTR	edge-turnservice-shv-02-gru2.facebook.com
157.240.12.49	A+PTR	edge-oculus-shv-02-gru2.fbcdn.net
157.240.12.49	A	oculusstorystudio.com
157.240.12.49	A	oculus.com
157.240.12.50	A+PTR	edge-z-p3-shv-02-gru2.facebook.com
157.240.12.50	A	z-p3-scontent-gru2-2.xx.fbcdn.net
157.240.12.50	A	z-p3-video-gru2-2.xx.fbcdn.net
157.240.12.51	A+PTR	edgeray-shv-02-gru2.facebook.com
157.240.12.52	A+PTR	instagram-p3-shv-02-gru2.fbcdn.net
157.240.12.52	A	scontent-b-gru.cdninstagram.com
157.240.12.52	A	scontent-b.cdninstagram.com
157.240.12.53	PTR	whatsapp-cdn-shv-02-gru2.fbcdn.net
157.240.12.53	A	w7ef4a7d91ksthfxnc-ge3dkmzyge4tmnby.snr.whatsapp.net
157.240.12.53	A	mmx.cdn.whatsapp.net
157.240.12.54	A+PTR	whatsapp-chatd-edge-shv-02-gru2.facebook.com
157.240.12.54	A	chat.cdn.whatsapp.net
157.240.12.169	A+PTR	edge-z-p4-shv-02-gru2.facebook.com
157.240.12.169	A	z-p4-scontent-gru2-2.xx.fbcdn.net
157.240.12.172	A+PTR	instagram-p4-shv-02-gru2.fbcdn.net
157.240.12.172	A	z-p4-instagram.c10r.facebook.com
157.240.12.172	A	z-p4-scontent.cdninstagram.com
157.240.12.174	A+PTR	instagram-p42-shv-02-gru2.fbcdn.net
157.240.12.174	A	z-p42-scontent.cdninstagram.com
157.240.12.174	A	z-p42-instagram.c10r.facebook.com