This file is indexed.

/etc/bind/db.255 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 broadcast zone
;
$TTL	604800
@	IN	SOA	localhost. root.localhost. (
			      1		; Serial
			 604800		; Refresh
			  86400		; Retry
			2419200		; Expire
			 604800 )	; Negative Cache TTL
;
@	IN	NS	localhost.