Robtex

Up: 157.240.204.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 157.240.206.0/24
Down right: 157.240.207.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
157.240.206.8	A+PTR	edge-video-shv-01-fml2.fbcdn.net
157.240.206.8	A	video-fml2-1.xx.fbcdn.net
157.240.206.14	A+PTR	xx-fbcdn-shv-01-fml2.fbcdn.net
157.240.206.14	A	scontent-fml2-1.xx.fbcdn.net
157.240.206.16	A+PTR	edge-star-shv-01-fml2.facebook.com
157.240.206.16	A	facebook.com.tw
157.240.206.16	A	facebook.it
157.240.206.35	A+PTR	edge-star-mini-shv-01-fml2.facebook.com
157.240.206.36	A+PTR	edge-z-m-mini-shv-01-fml2.facebook.com
157.240.206.38	PTR	edge-sonar-mini-shv-01-fml2.fbcdn.net
157.240.206.38	A	edgetee-lax3-2.xx.fbcdn.net
157.240.206.38	A	sonar-fml2-1.xx.fbcdn.net
157.240.206.50	A	oculusrift.com
157.240.206.60	A+PTR	whatsapp-cdn-shv-01-fml2.fbcdn.net
157.240.206.60	A	media-fml2-1.cdn.whatsapp.net
157.240.206.63	A+PTR	instagram-p3-shv-01-fml2.fbcdn.net
157.240.206.63	A	scontent-fml2-1.cdninstagram.com
157.240.207.8	A+PTR	edge-video-shv-01-fml1.fbcdn.net
157.240.207.8	A	video-fml1-1.xx.fbcdn.net
157.240.207.14	A+PTR	xx-fbcdn-shv-01-fml1.fbcdn.net
157.240.207.14	A	scontent-fml1-1.xx.fbcdn.net
157.240.207.36	A+PTR	edge-z-m-mini-shv-01-fml1.facebook.com
157.240.207.36	A	z-m-scontent-fml1-1.xx.fbcdn.net
157.240.207.38	A+PTR	edge-sonar-mini-shv-01-fml1.fbcdn.net
157.240.207.38	A	sonar-fml1-1.xx.fbcdn.net
157.240.207.38	A	edgetee-sea.xx.fbcdn.net
157.240.207.60	A+PTR	whatsapp-cdn-shv-01-fml1.fbcdn.net
157.240.207.60	A	media-fml1-1.cdn.whatsapp.net
157.240.207.63	A+PTR	instagram-p3-shv-01-fml1.fbcdn.net
157.240.207.63	A	scontent-fml1-1.cdninstagram.com