Robtex

Up: 157.240.12.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 157.240.12.128/26
Down right: 157.240.12.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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