Robtex

Up: 191.216.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 191.217.0.0/17
Down right: 191.217.128.0/17

IP	Type	Hostname
191.217.37.19	PTR	191-217-37-19.user3p.brasiltelecom.net.br
191.217.83.18	A	ns2.iphan.gov.br
191.217.83.19	A	ns4.iphan.gov.br
191.217.83.21	A	iphan.gov.br
191.217.83.28	A	antonina.iphan.gov.br
191.217.84.226	A+PTR	6732322493.e.brasiltelecom.net.br
191.217.120.46	A+PTR	6436511057.e.brasiltelecom.net.br