This file is indexed.

/etc/bind/db.0.168.192.in-addr.arpa. is in debian-edu-config 1.818+deb8u2.

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

The actual contents of the file can be viewed below.

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$TTL 500
@		IN	SOA	tjener.intern. root.postoffice.intern. (
				1 ; Serialnumber
				3600	; Refresh
				1800	; Retry
				720000	; Expire
				6400 )	; Minimum TTL
			NS	tjener.intern.
			MX	10 tjener.intern.
254			PTR	ltspserver00.subnet00.intern.