Robtex

Up: 191.240.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 191.240.224.0/20
Down right: 191.240.240.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
191.240.227.250	PTR	ip-191.240.227-250-cable.frionline.com.br
191.240.229.127	PTR	ip-191.240.229-127-cable.frionline.com.br
191.240.229.247	PTR	ip-191.240.229-247-cable.frionline.com.br
191.240.236.187	PTR	ip-191.240.236-187-cable.frionline.com.br
191.240.236.225	PTR	ip-191.240.236-225-cable.frionline.com.br
191.240.236.225	A	instagram.fsdu18-1.fna.fbcdn.net
191.240.237.76	PTR	cdn.google.frionline.com.br
191.240.237.76	A	r1.sn-4gpc0gbvvoapox-bpbe.googlevideo.com
191.240.237.77	PTR	cdn.google.frionline.com.br
191.240.237.77	A	r2.sn-4gpc0gbvvoapox-bpbe.googlevideo.com
191.240.237.78	PTR	cdn.google.frionline.com.br
191.240.237.78	A	r3---sn-4gpc0gbvvoapox-bpbe.googlevideo.com
191.240.255.3	A	nossafm963.com
191.240.255.3	A	brasilwork.com.br
191.240.255.3	A	jacintomoreira.com.br
191.240.255.6	PTR	ip-191.240.255-6-cloud.brasilcloud.com.br
191.240.255.7	PTR	ip-191.240.255-7-cloud.brasilcloud.com.br
191.240.255.38	A	radiovidanova.net
191.240.255.38	A	mail.maranhaonews.net
191.240.255.38	A	radiowebnacional.com
191.240.255.40	PTR	srv05.brasilwork.com.br
191.240.255.40	A	brasilwork.com.br
191.240.255.45	A	radiowebnacional.com
191.240.255.66	A	mx1.brasilwork.com.br
191.240.255.67	A	mx.proemail.com.br
191.240.255.67	A	mail.brasilwork.com.br
191.240.255.67	A	webmail.workmail.com.br
191.240.255.101	A+PTR	empresa01.sitebr.com.br
191.240.255.101	A	mail.symetric.com.br
191.240.255.102	A	sitebr.com.br
191.240.255.104	A	ambienteintimo.com.br