This file is indexed.

/etc/ypserv.conf is in nis 3.17.1-1build1.

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

The actual contents of the file can be viewed below.

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#
# ypserv.conf	In this file you can set certain options for the NIS server,
#		and you can deny or restrict access to certain maps based
#		on the originating host.
#
#		See ypserv.conf(5) for a description of the syntax.
#

# The following, when uncommented,  will give you shadow like passwords.
# Note that it will not work if you have slave NIS servers in your
# network that do not run the same server as you.

# Host                       : Domain  : Map              : Security
#
# *                          : *       : passwd.byname    : port/mangle       
# *                          : *       : passwd.byuid     : port/mangle       

# This is the default - restrict access to the shadow password file,
# allow access to all others.
*                            : *       : shadow.byname    : port
*                            : *       : passwd.adjunct.byname : port
*                            : *       : *                : none