Robtex

Up: 191.7.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 191.7.192.0/20
Down right: 191.7.208.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
191.7.192.10	PTR	10.192.7.191.online.net.br
191.7.192.70	PTR	191-7-192-70.online.net.br
191.7.192.84	PTR	84.192.7.191.online.net.br
191.7.192.84	A	leolar.com.br
191.7.192.84	A	b.ns.leolar.com.br
191.7.192.140	PTR	140.192.7.191.online.net.br
191.7.192.146	PTR	191-7-192-146.online.net.br
191.7.192.214	PTR	214.192.7.191.online.net.br
191.7.192.234	A	hotbel.com.br
191.7.193.10	PTR	10.193.7.191.online.net.br
191.7.193.21	PTR	21.193.7.191.online.net.br
191.7.193.50	PTR	50.193.7.191.online.net.br
191.7.193.50	A	rfedfdes3x.com
191.7.193.118	PTR	118.193.7.191.online.net.br
191.7.193.173	PTR	173.193.7.191.online.net.br
191.7.194.3	PTR	191-7-194-3.online.net.br
191.7.194.10	PTR	191-7-194-10.online.net.br
191.7.194.18	PTR	191-7-194-18.online.net.br
191.7.194.18	A	servidorpmsq.com
191.7.194.42	PTR	42.194.7.191.online.net.br
191.7.194.58	PTR	191-7-194-58.online.net.br
191.7.194.110	PTR	110.194.7.191.online.net.br
191.7.194.165	PTR	191-7-194-165.online.net.br
191.7.195.10	PTR	10.195.7.191.online.net.br
191.7.195.114	PTR	191-7-195-114.online.net.br
191.7.195.114	A	occ-2-1726-1865.1.nflxso.net
191.7.195.114	A	occ-0-1726-1801.1.nflxso.net
191.7.195.122	PTR	122.195.7.191.online.net.br
191.7.195.226	PTR	191-7-195-226.online.net.br
191.7.195.226	A	sqnet.net.br
191.7.195.227	A	ns2.sqnet.net.br
191.7.196.74	PTR	74.196.7.191.online.net.br
191.7.196.103	PTR	191-7-196-103.online.net.br
191.7.196.162	PTR	162.196.7.191.online.net.br
191.7.196.174	PTR	191-7-196-174.online.net.br
191.7.198.19	PTR	191-7-198-19.online.net.br
191.7.198.102	PTR	102.198.7.191.online.net.br
191.7.198.106	PTR	106.198.7.191.online.net.br
191.7.198.114	PTR	114.198.7.191.online.net.br
191.7.198.243	PTR	243.198.7.191.online.net.br
191.7.199.10	PTR	191-7-199-10.online.net.br
191.7.200.2	PTR	191-7-200-2.online.net.br
191.7.200.174	PTR	174.200.7.191.online.net.br
191.7.204.3	PTR	191-7-204-3.online.net.br
191.7.204.5	PTR	191-7-204-5.online.net.br
191.7.204.104	PTR	191-7-204-104.online.net.br
191.7.205.1	PTR	191-7-205-1.online.net.br
191.7.205.4	PTR	4.205.7.191.online.net.br
191.7.205.6	PTR	191-7-205-6.online.net.br
191.7.205.7	PTR	191-7-205-7.online.net.br
191.7.205.102	PTR	191-7-205-102.online.net.br
191.7.206.5	PTR	191-7-206-5.online.net.br
191.7.206.19	PTR	191-7-206-19.online.net.br
191.7.206.194	PTR	191-7-206-194.online.net.br
191.7.206.194	A	www.flashnetcaxias.com.br
191.7.206.194	A	flashnetcaxias.com.br
191.7.206.222	PTR	191-7-206-222.online.net.br
191.7.206.222	A	connectma.com.br
191.7.207.6	PTR	191-7-207-6.online.net.br
191.7.207.10	PTR	10.207.7.191.online.net.br
191.7.208.17	PTR	17.208.7.191.online.net.br
191.7.208.57	PTR	191-7-208-57.online.net.br
191.7.209.21	PTR	191-7-209-21.online.net.br
191.7.209.74	PTR	74.209.7.191.online.net.br
191.7.209.166	PTR	166.209.7.191.online.net.br
191.7.209.222	PTR	222.209.7.191.online.net.br
191.7.211.17	PTR	17.211.7.191.online.net.br
191.7.211.17	A	scontent.ffor12-1.fna.fbcdn.net
191.7.211.17	A	external.ffor12-1.fna.fbcdn.net
191.7.211.18	PTR	18.211.7.191.online.net.br
191.7.211.30	PTR	30.211.7.191.online.net.br
191.7.211.30	A	sonar.ffor12-1.fna.fbcdn.net
191.7.211.32	PTR	191-7-211-32.online.net.br
191.7.211.32	A	z-p3-scontent.ffor12-1.fna.fbcdn.net
191.7.211.33	PTR	33.211.7.191.online.net.br
191.7.211.33	A	instagram.ffor12-1.fna.fbcdn.net
191.7.211.34	PTR	191-7-211-34.online.net.br
191.7.211.34	A	media.ffor12-1.fna.whatsapp.net
191.7.211.40	PTR	191-7-211-40.online.net.br
191.7.211.40	A	z-1-scontent.ffor12-1.fna.fbcdn.net
191.7.211.74	PTR	74.211.7.191.online.net.br
191.7.211.146	PTR	146.211.7.191.in-addr.arpa
191.7.211.146	A	www.newinfor.com.br
191.7.211.174	PTR	174.211.7.191.online.net.br
191.7.211.177	PTR	191-7-211-177.online.net.br
191.7.212.6	PTR	6.212.7.191.online.net.br
191.7.212.50	PTR	50.212.7.191.online.net.br
191.7.212.58	PTR	58.212.7.191.online.net.br
191.7.212.146	PTR	146.212.7.191.online.net.br
191.7.212.146	A	jmsistemaserp.com
191.7.212.166	PTR	191-7-212-166.online.net.br
191.7.212.226	PTR	191-7-212-226.online.net.br
191.7.212.254	PTR	191-7-212-254.online.net.br
191.7.213.12	PTR	cache.google.com
191.7.213.13	PTR	13.213.7.191.in-addr.arpa
191.7.213.13	A	r2---sn-voapoxoxucg-4vge.googlevideo.com
191.7.213.13	A	r2.sn-voapoxoxucg-4vge.c.android.clients.google.com
191.7.213.14	PTR	14.213.7.191.online.net.br
191.7.213.14	A	r3---sn-voapoxoxucg-4vge.googlevideo.com
191.7.213.14	A	r3---sn-voapoxoxucg-4vge.gvt1.com
191.7.213.118	PTR	191-7-213-118.online.net.br
191.7.213.181	PTR	191-7-213-181.online.net.br
191.7.213.234	PTR	234.213.7.191.online.net.br
191.7.213.254	PTR	254.213.7.191.online.net.br
191.7.213.254	A	ns.online.net.br
191.7.214.37	PTR	191-7-214-37.online.net.br
191.7.214.148	PTR	191-7-214-148.online.net.br
191.7.214.148	A	ivaeduca.com.br
191.7.214.162	PTR	191-7-214-162.online.net.br
191.7.214.209	PTR	209.214.7.191.online.net.br
191.7.214.224	PTR	224.214.7.191.online.net.br
191.7.215.4	PTR	191-7-215-4.online.net.br
191.7.215.18	A	ns2.online.net.br
191.7.215.22	A	ns.online.net.br
191.7.216.226	PTR	226.216.7.191.online.net.br
191.7.217.141	PTR	141.217.7.191.online.net.br
191.7.217.254	PTR	254.217.7.191.online.net.br
191.7.218.98	PTR	191-7-218-98.online.net.br
191.7.218.243	PTR	191-7-218-243.online.net.br
191.7.218.244	PTR	244.218.7.191.online.net.br
191.7.218.244	A	mailserver.astelnet.com.br
191.7.218.246	PTR	191-7-218-246.online.net.br
191.7.218.246	A	astelnet.com.br
191.7.219.115	PTR	115.219.7.191.online.net.br
191.7.219.117	PTR	117.219.7.191.online.net.br