Robtex

Up: 177.73.240.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 177.73.240.0/25
Down right: 177.73.240.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
177.73.240.0	PTR	static-177-73-240-0.viasultelecom.net.br
177.73.240.198	PTR	mail.viasultelecom.com.br
177.73.240.198	A	mail.viasultelecom.net.br
177.73.240.200	PTR	ns1.viasultelecom.com.br
177.73.240.200	A	mail.vst.net.br
177.73.240.200	A	viasultelecom.net.br
177.73.240.201	A+PTR	ns2.viasultelecom.com.br
177.73.240.201	PTR	www.viasultelecom.com.br
177.73.240.201	A	viasultelecom.com.br
177.73.240.203	A	www.viasultelecom.com.br
177.73.240.203	A	www.vst.net.br
177.73.240.203	A	vst.net.br