/etc/ax25/nrports is in libax25 0.0.12-rc2+cvs20120204-3.
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 | # /etc/ax25/nrports
#
# The format of this file is:
#
# name callsign alias paclen description
#
#netrom OH2BNS-10 #LNODE 235 Switch Port
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