The section 126.96.36.199 Network Limits > net.inet.ip.portrange.* of the Handbook seems to be outdated.
For example, it mentions:
> Most network programs use the default range which is controlled by net.inet.ip.portrange.first and net.inet.ip.portrange.last, which default to 1024 and 5000, respectively.
However, the current limits on FreeBSD 12.1 are:
So I believe the default limits have been raised since the paragraph has been written.
If that is true, (at least) the following sentence won't also be correct:
> A value of 10000, 20000 or 30000 may be reasonable.
Thanks for the report. I'll open it for the doc committers to take care of it.
Seems this bug report is a duplicate of bug #223997 - FreeBSD Handbook Section 11.11 Guidelines on net.inet.ip.portrange obselete