Robtex

Up: 191.241.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 191.241.64.0/22
Down right: 191.241.68.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
191.241.65.194	PTR	194.65.241.191.k2telecom.net.br
191.241.66.22	PTR	22.66.241.191.k2telecom.net.br
191.241.66.62	PTR	62.66.241.191.k2telecom.net.br
191.241.66.62	A	rionet.net
191.241.66.82	PTR	82.66.241.191.k2telecom.net.br
191.241.66.238	PTR	238.66.241.191.k2telecom.net.br
191.241.67.14	PTR	14.67.241.191.k2telecom.net.br
191.241.67.14	A	speedtest.k2telecom.net.br
191.241.67.70	PTR	70.67.241.191.k2telecom.net.br
191.241.67.250	PTR	250.67.241.191.k2telecom.net.br
191.241.67.250	A	www.icnextelecom.com.br
191.241.68.234	PTR	68-241-191-234.dynamic.k2telecom.com.br
191.241.69.48	PTR	48.69.241.191.k2telecom.net.br
191.241.70.5	PTR	5.70.241.191.k2telecom.net.br
191.241.70.96	PTR	96.70.241.191.k2telecom.net.br
191.241.70.249	PTR	249.70.241.191.k2telecom.net.br
191.241.71.81	PTR	81.71.241.191.k2telecom.net.br
191.241.71.81	A	scontent.fgig6-1.fna.fbcdn.net
191.241.71.82	PTR	82.71.241.191.k2telecom.net.br
191.241.71.82	A	video.fgig6-1.fna.fbcdn.net
191.241.71.94	PTR	94.71.241.191.k2telecom.net.br
191.241.71.94	A	sonar.fgig6-1.fna.fbcdn.net
191.241.71.96	PTR	96.71.241.191.k2telecom.net.br
191.241.71.96	A	z-p3-scontent.fgig6-1.fna.fbcdn.net
191.241.71.97	PTR	97.71.241.191.k2telecom.net.br
191.241.71.97	A	instagram.fgig6-1.fna.fbcdn.net
191.241.71.98	PTR	98.71.241.191.k2telecom.net.br
191.241.71.98	A	media.fgig6-1.fna.whatsapp.net
191.241.71.254	PTR	254.71.241.191.k2telecom.net.br
191.241.71.254	A	occ-2-1824-420.1.nflxso.net
191.241.71.254	A	occ-2-1824-1380.1.nflxso.net