This file is indexed.

/etc/bindresvport.blacklist is in libc-bin 2.27-3ubuntu1.

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 contains a list of port numbers between 600 and 1024,
# which should not be used by bindresvport. bindresvport is mostly
# called by RPC services. This mostly solves the problem, that a
# RPC service uses a well known port of another service.
#
631	# cups
636	# ldaps
655	# tinc
774	# rpasswd
783	# spamd
873	# rsync
921	# lwresd
993	# imaps
995	# pops