Robtex

Up: 177.20.192.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 177.20.208.0/21
Down right: 177.20.216.0/21

IP	Type	Hostname
177.20.208.90	PTR	90.208.20.177.itnet.com.br
177.20.208.115	PTR	ns1.itnettelecom.com.br
177.20.208.118	PTR	177.20.208.118.itnettelecom.com.br
177.20.208.118	A	speedtest.itnettelecom.com.br
177.20.208.131	A+PTR	ns1.itnetnetworks.com.br
177.20.208.131	A	ns1.itnetwebhost.com.br
177.20.208.132	PTR	177.20.208.132.itnettelecom.com.br
177.20.208.132	A	ns2.itnetnetworks.com.br
177.20.208.132	A	ns2.itnetwebhost.com.br
177.20.208.135	PTR	itnetweb.com.br
177.20.208.171	A	ns2.itnettelecom.com.br
177.20.208.178	PTR	it.ita-it01.itnet.com.br
177.20.208.197	PTR	cache.google.com
177.20.208.204	PTR	cache.google.com
177.20.208.204	A	r1.sn-puoxucg-5w0e.googlevideo.com
177.20.208.205	PTR	cache.google.com
177.20.208.205	A	r2.sn-puoxucg-5w0e.googlevideo.com
177.20.209.51	PTR	177.20.209.51.itnettelecom.com.br
177.20.209.115	A+PTR	ns1.itnettelecom.com.br
177.20.210.17	PTR	177.20.210.17.itnettelecom.com.br
177.20.210.17	A	scontent.faju8-1.fna.fbcdn.net
177.20.210.33	PTR	177.20.210.33.itnettelecom.com.br
177.20.210.33	A	instagram.faju8-1.fna.fbcdn.net
177.20.210.125	PTR	177.20.210.125.itnettelecom.com.br
177.20.215.7	PTR	177.20.215.7.ita.itnet.com.br
177.20.219.5	PTR	177.20.219.5.ita.itnet.com.br
177.20.223.250	PTR	177.20.223.250.ita.itnet.com.br