Robtex

Up: 170.245.232.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 170.245.236.0/23
Down right: 170.245.238.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
170.245.236.0	PTR	0-236-245-170.iclicktelecom.net.br
170.245.239.250	PTR	250-239-245-170.iclicktelecom.net.br
170.245.239.250	A	iclicktelecom.net.br
170.245.239.250	A	ns1.iclicktelecom.net.br
170.245.239.254	PTR	mail.iclicktelecom.com.br
170.245.239.254	PTR	imap.iclicktelecom.com.br
170.245.239.254	PTR	ns1.iclicktelecom.net.br