pi@noads:~ $ apt-file list bind9
/usr/sbin/named
pi@noads:~ $ apt show bind9
Description: Internet Domain Name Server
The Berkeley Internet Name Domain (BIND) implements an Internet domain
name server. BIND is the most widely-used name server software on the
Internet, and is supported by the Internet Software Consortium, www.isc.org.
.
This package provides the server and related configuration files.