Solve IPv4 categorisation issues with the ipaddress module

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-11-08.21:06:11.802>
labels = ['type-bug', 'library', '3.9']
title = 'Solve IPv4 categorisation issues with the ipaddress module'
updated_at = <Date 2020-01-01.08:39:08.606>
user = 'https://github.com/JamoBox'

bugs.python.org fields:

activity = <Date 2020-01-01.08:39:08.606>
actor = 'samjonas'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-11-08.21:06:11.802>
creator = 'Wicken'
dependencies = []
files = []
hgrepos = []
issue_num = 38750
keywords = []
message_count = 3.0
messages = ['356265', '356267', '359148']
nosy_count = 3.0
nosy_names = ['pmoody', 'samjonas', 'Wicken']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38750'
versions = ['Python 3.9']