Robtex

Up: 31.13.72.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.13.73.0/25
Down right: 31.13.73.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.13.73.1	PTR	livestream-edgetee-upload-shv-01-dub4.facebook.com
31.13.73.1	A	www.29ckck.com
31.13.73.1	A	cp16919.com
31.13.73.2	A	xn--ovwrf23c.com
31.13.73.2	A	xs28288.com
31.13.73.3	A+PTR	edge-fblite-ws-p1-shv-01-dub4.facebook.com
31.13.73.3	A	netprobe-bgp-01-dub4.facebook.com
31.13.73.4	A+PTR	edge-z-shv-01-mia1.facebook.com
31.13.73.4	A	sf999.be
31.13.73.4	A	www.greenvvv.com
31.13.73.5	A+PTR	netprobe-bgp-01-mia1.facebook.com
31.13.73.6	PTR	edge-z-m-shv-01-mia1.facebook.com
31.13.73.6	A	www.facebook.beta.facebook.com
31.13.73.6	A	www.fs.beta.facebook.com
31.13.73.7	PTR	edge-stun-shv-01-dub4.facebook.com
31.13.73.7	A	profile-b-lax.xx.fbcdn.net
31.13.73.7	A	edge-cryptossl-shv-01-dub4.facebook.com
31.13.73.8	PTR	edge-z-1-shv-01-mia1.facebook.com
31.13.73.9	A	z-m-fbcdn-shv-01-mia1.fbcdn.net
31.13.73.10	A	instagram-shv-01-mia1.fbcdn.net
31.13.73.12	PTR	edge-liverail-shv-01-mia1.facebook.com
31.13.73.12	A	www.yisf.com
31.13.73.12	A	bbmm7788.com
31.13.73.14	A+PTR	edge-video-shv-01-mia1.fbcdn.net
31.13.73.14	A	video-mia.xx.fbcdn.net
31.13.73.14	A	video-mia1-1.xx.fbcdn.net
31.13.73.16	A	livestream-edgetee-upload-shv-01-mia1.facebook.com
31.13.73.17	A	tyc44555.com
31.13.73.17	A	tyc1070.com
31.13.73.17	A	999m99.com
31.13.73.18	PTR	edge-star-shv-01-dub4.facebook.com
31.13.73.18	A	appspot.com--1212918.jjwxc.net
31.13.73.18	A	facebookdeveloperfaq.com
31.13.73.19	A+PTR	edge-video-shv-01-dub4.fbcdn.net
31.13.73.19	A	edge-extern-shv-01-mia1.facebook.com
31.13.73.19	A	video-dub4-1.xx.fbcdn.net
31.13.73.20	A+PTR	livestream-edgetee-shv-01-mia1.facebook.com
31.13.73.20	A	edgetee-mia1-1.xx.fbcdn.net
31.13.73.21	A	edge-z-p1-shv-01-mia1.facebook.com
31.13.73.22	A	scontent-dub4-1.xx.fbcdn.net
31.13.73.22	A	xx-fbcdn-shv-01-dub4.fbcdn.net
31.13.73.23	PTR	edge-services-shv-01-dub4.facebook.com
31.13.73.23	A	604919.com
31.13.73.23	A	ben919.com
31.13.73.25	PTR	livestream-fblive-upload-shv-01-dub4.facebook.com
31.13.73.28	A	shortwave.c10r.facebook.com
31.13.73.32	A+PTR	edge-z-mini-shv-01-mia1.facebook.com
31.13.73.33	PTR	edge-snaptu-http-mini-shv-01-dub4.facebook.com
31.13.73.33	A	edge-snaptu-http-mini-shv-01-mia1.facebook.com
31.13.73.34	PTR	edge-sonar-mini-shv-01-dub4.fbcdn.net
31.13.73.34	A	f020a1efb80-fxvtjpoi1547861184-sonar.xx.fbcdn.net
31.13.73.34	A	f65373a3080-oyxrjbqm1544777119-sonar.xz.fbcdn.net
31.13.73.35	PTR	edge-star-mini-shv-01-dub4.facebook.com
31.13.73.35	A	fefcbc9f480kyyzaibi-nuzorvoi1486414691-sonar.xz.fbcdn.net
31.13.73.35	A	fd229094a80kxbczagy-mxyuxcsy1496273975-sonar.xz.fbcdn.net
31.13.73.36	A+PTR	edge-z-m-mini-shv-01-dub4.facebook.com
31.13.73.36	A	fdbcdn.com
31.13.73.36	A	z-m-scontent-dub4-1.xx.fbcdn.net
31.13.73.37	A+PTR	instagram-p15-shv-01-dub4.fbcdn.net
31.13.73.37	A	sg2.atfacebook.net
31.13.73.38	A	z-m-scontent-mia.xx.fbcdn.net
31.13.73.38	A	z-m-scontent-mia1-1.xx.fbcdn.net
31.13.73.40	A+PTR	edge-snaptu-http-p2-shv-01-dub4.facebook.com
31.13.73.40	A	z-1-video-mia1-1.xx.fbcdn.net
31.13.73.40	A	edge-z-1-p2-shv-01-mia1.facebook.com
31.13.73.41	A	edge-snaptu-http-p2-shv-01-mia1.facebook.com
31.13.73.48	A	edgeray-shv-01-mia1.facebook.com
31.13.73.50	PTR	edge-z-p3-shv-01-dub4.facebook.com
31.13.73.50	A	z-p3-scontent-dub4-1.xx.fbcdn.net
31.13.73.50	A	edge-turn-bgp-01-mia1.facebook.com
31.13.73.51	A+PTR	edgeray-shv-01-dub4.facebook.com
31.13.73.51	A	edge-oculus-shv-01-mia1.fbcdn.net
31.13.73.51	A	www.wlswsj.com
31.13.73.52	A+PTR	whatsapp-cdn-shv-01-dub4.fbcdn.net
31.13.73.52	A	w96481a061kizmhawb-gm3dsmbrgy3daoby.snr.whatsapp.net
31.13.73.52	A	w5f1720061kuv6jbea-gmzdcnrsga3tomju.snr.whatsapp.net
31.13.73.53	A+PTR	whatsapp-chatd-edge-shv-01-dub4.facebook.com
31.13.73.53	A	z-p3-video-mia1-1.xx.fbcdn.net
31.13.73.53	A	z-p3-scontent-mia1-1.xx.fbcdn.net
31.13.73.54	A+PTR	edge-turnservice-shv-01-mia1.facebook.com
31.13.73.63	A+PTR	instagram-p3-shv-01-dub4.fbcdn.net
31.13.73.63	A	scontent-dub4-1.cdninstagram.com
31.13.73.65	PTR	edge-star-shv-05-mia1.facebook.com
31.13.73.82	PTR	edge-atlas-shv-06-mia1.facebook.com
31.13.73.89	PTR	z-m-fbcdn-shv-06-mia1.fbcdn.net
31.13.73.96	PTR	instagram-shv-07-mia1.fbcdn.net
31.13.73.98	PTR	edge-atlas-shv-07-mia1.facebook.com
31.13.73.102	PTR	edge-z-m-shv-07-mia1.facebook.com
31.13.73.105	PTR	z-m-fbcdn-shv-07-mia1.fbcdn.net
31.13.73.130	PTR	edge-atlas-shv-09-mia1.facebook.com
31.13.73.168	PTR	edge-dgw-p4-shv-01-dub4.facebook.com
31.13.73.174	A+PTR	instagram-p42-shv-01-dub4.fbcdn.net
31.13.73.174	A	z-p42-scontent-dub4-1.cdninstagram.com