Robtex

Up: 170.51.240.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 170.51.244.0/23
Down right: 170.51.246.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
170.51.244.12	A	r1---sn-jup-x1xz.gvt1.com
170.51.244.12	A	r1---sn-jup-x1xz.googlevideo.com
170.51.244.12	A	r1.sn-jup-x1xz.googlevideo.com
170.51.244.13	PTR	host13.170-51-244.telmex.net.ar
170.51.244.13	A	r2.sn-jup-x1xz.gvt1.com
170.51.244.14	PTR	cache.google.com
170.51.244.15	PTR	host15.170-51-244.telmex.net.ar
170.51.244.140	PTR	host140.170-51-244.telmex.net.ar
170.51.244.140	A	r1.sn-ja5gv5g-x1xl.googlevideo.com
170.51.244.140	A	r1---sn-ja5gv5g-x1xl.gvt1.com
170.51.244.141	PTR	host141.170-51-244.telmex.net.ar
170.51.244.141	A	r2---sn-ja5gv5g-x1xl.gvt1.com
170.51.244.142	PTR	host142.170-51-244.telmex.net.ar
170.51.244.143	PTR	cache.google.com
170.51.244.144	PTR	cache.google.com
170.51.244.144	A	r5---sn-ja5gv5g-x1xl.gvt1.com
170.51.244.144	A	r5.sn-ja5gv5g-x1xl.gvt1.com
170.51.244.145	PTR	cache.google.com
170.51.244.145	A	r6---sn-ja5gv5g-x1xl.googlevideo.com
170.51.244.180	PTR	host180.170-51-244.telmex.net.ar
170.51.245.16	PTR	host16.170-51-245.telmex.net.ar
170.51.245.17	PTR	host17.170-51-245.telmex.net.ar
170.51.245.17	A	scontent.faep7-1.fna.fbcdn.net
170.51.245.18	PTR	host18.170-51-245.telmex.net.ar
170.51.245.18	A	video.faep7-1.fna.fbcdn.net
170.51.245.30	PTR	host30.170-51-245.telmex.net.ar
170.51.245.30	A	sonar.faep7-1.fna.fbcdn.net
170.51.245.32	PTR	host32.170-51-245.telmex.net.ar
170.51.245.32	A	z-p3-scontent.faep7-1.fna.fbcdn.net
170.51.245.33	PTR	host33.170-51-245.telmex.net.ar
170.51.245.33	A	instagram.faep7-1.fna.fbcdn.net
170.51.245.34	PTR	host34.170-51-245.telmex.net.ar
170.51.245.34	A	media.faep7-1.fna.whatsapp.net
170.51.245.241	PTR	host241.170-51-245.telmex.net.ar
170.51.246.2	PTR	host2.170-51-246.telmex.net.ar
170.51.246.2	A	occ-0-1700-28.1.nflxso.net
170.51.246.2	A	occ-0-1700-27.1.nflxso.net
170.51.246.3	PTR	host3.170-51-246.telmex.net.ar
170.51.246.3	A	occ-0-1700-28.1.nflxso.net
170.51.246.3	A	occ-0-1700-27.1.nflxso.net
170.51.246.4	PTR	host4.170-51-246.telmex.net.ar
170.51.246.4	A	occ-0-1700-28.1.nflxso.net
170.51.246.4	A	occ-0-1700-27.1.nflxso.net
170.51.246.5	PTR	host5.170-51-246.telmex.net.ar
170.51.246.5	A	occ-0-1700-28.1.nflxso.net
170.51.246.5	A	occ-0-1700-27.1.nflxso.net
170.51.246.10	A	occ-0-1700-28.1.nflxso.net
170.51.246.11	A	occ-1-1700-185.1.nflxso.net
170.51.246.95	PTR	host95.170-51-246.telmex.net.ar
170.51.246.121	PTR	host121.170-51-246.telmex.net.ar
170.51.246.129	PTR	host129.170-51-246.telmex.net.ar
170.51.246.159	PTR	host159.170-51-246.telmex.net.ar
170.51.246.194	PTR	host194.170-51-246.telmex.net.ar
170.51.247.19	PTR	host19.170-51-247.telmex.net.ar
170.51.247.25	PTR	host25.170-51-247.telmex.net.ar
170.51.247.95	PTR	host95.170-51-247.telmex.net.ar
170.51.247.187	PTR	host187.170-51-247.telmex.net.ar