This file is indexed.

/etc/bind/db.empty is in bind9 1:9.9.5.dfsg-3ubuntu0.19.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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; BIND reverse data file for empty rfc1918 zone
;
; DO NOT EDIT THIS FILE - it is used for multiple zones.
; Instead, copy it, edit named.conf, and use that copy.
;
$TTL	86400
@	IN	SOA	localhost. root.localhost. (
			      1		; Serial
			 604800		; Refresh
			  86400		; Retry
			2419200		; Expire
			  86400 )	; Negative Cache TTL
;
@	IN	NS	localhost.