/etc/ypserv.securenets 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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | #
# securenets This file defines the access rights to your NIS server
# for NIS clients (and slave servers - ypxfrd uses this
# file too). This file contains netmask/network pairs.
# A clients IP address needs to match with at least one
# of those.
#
# One can use the word "host" instead of a netmask of
# 255.255.255.255. Only IP addresses are allowed in this
# file, not hostnames.
#
# Always allow access for localhost
255.0.0.0 127.0.0.0
# This line gives access to everybody. PLEASE ADJUST!
0.0.0.0 0.0.0.0
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