This file is indexed.

/etc/nbdtab is in nbd-client 1:3.16.2-1.

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

The actual contents of the file can be viewed below.

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# This file configures NBD devices for use with nbd-client.
# Its fields are:
#
# device server_hostname_or_ip exportname [options]
#
# For more information, see nbdtab(5)
# This default configuration has no devices configured.