Robtex

Up: 31.13.74.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.13.75.0/25
Down right: 31.13.75.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.13.75.1	A+PTR	netprobe-bgp-01-mrs1.facebook.com
31.13.75.2	A+PTR	edge-atlas-shv-01-mrs1.facebook.com
31.13.75.3	A	edge-cryptossl-shv-01-mrs1.facebook.com
31.13.75.3	A	dlbwsj.com
31.13.75.3	A	tyc018018.com
31.13.75.4	A+PTR	edge-latest-shv-01-mrs1.facebook.com
31.13.75.5	PTR	secure-edge-latest-shv-02-hkt1.facebook.com
31.13.75.5	A	edge-mqtt-shv-01-mrs1.facebook.com
31.13.75.6	A+PTR	edge-snaptu-http-p1-shv-01-mrs1.facebook.com
31.13.75.6	A	edge-snaptu-tunnel-shv-01-mrs1.facebook.com
31.13.75.7	A+PTR	secure-edge-latest-shv-01-mrs1.facebook.com
31.13.75.7	A	edge-sonar-shv-01-mrs1.fbcdn.net
31.13.75.8	A	edge-star-mrs1-1.xx.fbcdn.net
31.13.75.8	A	edge-star-shv-01-mrs1.facebook.com
31.13.75.9	A	shvpn5.com
31.13.75.9	A	hao123c.com
31.13.75.9	A	17388aq.com
31.13.75.10	A+PTR	edge-z-1-shv-01-mrs1.facebook.com
31.13.75.11	PTR	perfstar-01-01-pao1.facebook.com
31.13.75.12	PTR	edge-fblite-ws-p1-shv-02-hkt1.facebook.com
31.13.75.12	A	f4fbcb73f80kzgsxnha-nawtrjrp1496607640-sonar.xx.fbcdn.net
31.13.75.12	A	fa318efbe80kz2xmloi-hskvtqih1496222304-sonar.xx.fbcdn.net
31.13.75.14	A	video-mrs1-1.xx.fbcdn.net
31.13.75.14	A	edge-video-shv-01-mrs1.fbcdn.net
31.13.75.14	A	video-mrs.xx.fbcdn.net
31.13.75.15	PTR	edge-secure-shv-02-hkt1.facebook.com
31.13.75.15	A	vpnskyw.com
31.13.75.15	A	sxlwsj.com
31.13.75.16	PTR	edge-mqtt-latest-shv-02-hkt1.facebook.com
31.13.75.16	A	www.yingsuos.com
31.13.75.16	A	xn--fiq7v44hib844azmdo49a923c.com
31.13.75.17	PTR	edge-msgr-latest-shv-02-hkt1.facebook.com
31.13.75.17	A	long8898.com
31.13.75.17	A	noevils.com
31.13.75.18	PTR	edge-z-p1-shv-02-hkt1.facebook.com
31.13.75.18	A	noevils.com
31.13.75.18	A	xpj7897899.com
31.13.75.19	PTR	edge-mqtt-shv-02-pao1.facebook.com
31.13.75.19	A	edgetee-mrs.xx.fbcdn.net
31.13.75.19	A	edgetee-mrs1-1.xx.fbcdn.net
31.13.75.20	PTR	perfedge-m-shv-02-pao1.facebook.com
31.13.75.20	A	edge-z-p1-shv-01-mrs1.facebook.com
31.13.75.22	PTR	edge-livestream-api-upload-shv-01-mrs1.facebook.com
31.13.75.27	PTR	perfstar-01-02-pao1.facebook.com
31.13.75.27	A	edge-shortwave-shv-01-mrs1.facebook.com
31.13.75.32	PTR	edge-z-mini-shv-01-mrs1.facebook.com
31.13.75.32	A	instagram-p15-shv-01-mrs1.fbcdn.net
31.13.75.33	A	edge-snaptu-http-mini-shv-01-mrs1.facebook.com
31.13.75.34	PTR	edge-mqtt-mini-shv-02-hkt1.facebook.com
31.13.75.34	A	edge-mqtt-mini-shv-01-mrs1.facebook.com
31.13.75.35	PTR	edge-star-mini-shv-02-hkt1.facebook.com
31.13.75.35	A	f020a1efb80-fxvtjpoi1547861184-sonar.xx.fbcdn.net
31.13.75.35	A	httpscontent-lax3-1.xx.fbcdn.net
31.13.75.36	A	1461683775.com
31.13.75.36	A	bogou888rwwwbodog888.com
31.13.75.37	A+PTR	edge-z-m-mini-shv-01-mrs1.facebook.com
31.13.75.38	A	z-m-scontent-mrs1-1.xx.fbcdn.net
31.13.75.38	A	z-m-scontent-mrs.xx.fbcdn.net
31.13.75.38	A	edge-star-z-mini-shv-01-mrs1.facebook.com
31.13.75.39	A+PTR	iorg-fba-edge-shv-01-mrs1.facebook.com
31.13.75.40	A	arcliu.com
31.13.75.40	A	kpcp555.com
31.13.75.40	A	wwww.bodog888.com.wscy.cn
31.13.75.41	A	edge-snaptu-http-p2-shv-01-mrs1.facebook.com
31.13.75.48	A+PTR	whatsapp-chatd-edge-shv-01-mrs1.facebook.com
31.13.75.49	A+PTR	edgeray-shv-01-mrs1.facebook.com
31.13.75.51	A	xn--11-sx2g23c.com
31.13.75.51	A	zeastech.com
31.13.75.51	A	edge-oculus-shv-01-mrs1.fbcdn.net
31.13.75.52	A	w7ef4a7d91ksthfxnc-ge3dkmzyge4tmnby.snr.whatsapp.net
31.13.75.52	A	w8122e7271kzkrnsyc-ge4tamrzg4ztkobs.snr.whatsapp.net
31.13.75.52	A	media-mrs1-1.cdn.whatsapp.net
31.13.75.54	A	z-p3-scontent-mrs.xx.fbcdn.net
31.13.75.54	A	z-p3-scontent-mrs1-1.xx.fbcdn.net
31.13.75.54	A	z-p3-video-mrs1-1.xx.fbcdn.net
31.13.75.55	PTR	edge-turnservice-shv-01-mrs1.facebook.com
31.13.75.60	PTR	whatsapp-cdn-shv-02-hkt1.fbcdn.net
31.13.75.169	A+PTR	edge-z-p4-shv-01-mrs1.facebook.com
31.13.75.169	A	z-p4-scontent-mrs1-1.xx.fbcdn.net
31.13.75.172	A+PTR	instagram-p4-shv-01-mrs1.fbcdn.net
31.13.75.172	A	z-p4-scontent-mrs1-1.cdninstagram.com