Robtex

Up: 157.240.198.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 157.240.198.0/25
Down right: 157.240.198.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
157.240.198.1	A+PTR	livestream-edgetee-upload-shv-01-del1.facebook.com
157.240.198.1	A	edgetee-upload-del.xx.fbcdn.net
157.240.198.9	A+PTR	edge-video-shv-01-del1.fbcdn.net
157.240.198.9	A	video-del1-1.xx.fbcdn.net
157.240.198.15	A+PTR	xx-fbcdn-shv-01-del1.fbcdn.net
157.240.198.15	A	scontent-del1-1.xx.fbcdn.net
157.240.198.17	A+PTR	edge-star-shv-01-del1.facebook.com
157.240.198.24	A+PTR	edge-mqtt-shv-01-del1.facebook.com
157.240.198.34	A+PTR	edge-mqtt-mini-shv-01-del1.facebook.com
157.240.198.35	A+PTR	edge-star-mini-shv-01-del1.facebook.com
157.240.198.38	A	netstatic.xx.fbcdn.net
157.240.198.38	A	f02f4e4c080kdbudr5q-tgemfodx1490368375-sonar.xz.fbcdn.net
157.240.198.38	A	f33abcdc480k2kgxaiq-todjextk1491384222-sonar.xx.fbcdn.net
157.240.198.60	A+PTR	whatsapp-cdn-shv-01-del1.fbcdn.net
157.240.198.60	A	media-del1-1.cdn.whatsapp.net
157.240.198.61	A+PTR	whatsapp-chatd-edge-shv-01-del1.facebook.com
157.240.198.63	A+PTR	instagram-p3-shv-01-del1.fbcdn.net
157.240.198.63	A	scontent-del1-1.cdninstagram.com
157.240.198.174	A+PTR	instagram-p42-shv-01-del1.fbcdn.net