[issue35734] ipaddress's _BaseV4._is_valid_netmask fails to detect invalid netmask like 255.254.128.0

[ulin]

New submission from ulin :

valid netmask like 255.0.0.0 255.128.0.0, but 255.254.128.0 is not valid, but 
ipaddress._BaseV4._is_valid_netmask fails to detect the latter.

Tested in Python 3.6.7, as the code stays the same, affects all after Python 
3.6.7.

--
components: Library (Lib)
files: test_ipaddress.py
messages: 333581
nosy: ulindog
priority: normal
severity: normal
status: open
title: ipaddress's _BaseV4._is_valid_netmask fails to  detect invalid netmask 
like 255.254.128.0
type: behavior
versions: Python 3.8
Added file: https://bugs.python.org/file48047/test_ipaddress.py

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[issue35734] Remove unused _BaseV4._is_valid_netmask in ipaddress

[ulin]

ulin  added the comment:

OK, message copied, I'll mark it closed. :)

--
resolution:  -> not a bug
stage: patch review -> resolved
status: open -> closed

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