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ipaddress - add ability to get next closest network of any prefix size #87027
Description
| BPO | 42861 |
|---|---|
| Nosy | @ericvsmith, @777GE90 |
| PRs |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = None
closed_at = None
created_at = <Date 2021-01-08.00:30:51.031>
labels = ['type-feature', 'library', '3.10']
title = 'ipaddress - add ability to get next closest network of any prefix size'
updated_at = <Date 2021-07-17.22:04:30.115>
user = 'https://github.com/777GE90'bugs.python.org fields:
activity = <Date 2021-07-17.22:04:30.115>
actor = 'eric.smith'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-01-08.00:30:51.031>
creator = 'fasial.mahmood94'
dependencies = []
files = []
hgrepos = []
issue_num = 42861
keywords = ['patch']
message_count = 4.0
messages = ['384623', '384624', '384732', '386648']
nosy_count = 3.0
nosy_names = ['eric.smith', 'pmoody', 'fasial.mahmood94']
pr_nums = ['24180']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42861'
versions = ['Python 3.10']Linked PRs
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777GE90 commented on Jan 8, 2021
The ipaddress module in Python is an excellent tool, but I noticed it is missing a feature that I needed several months ago, which is the ability to find the next closest subnet with a specific prefix length.
For example, imagine I had a IPv4Network("10.10.0.72/30"), how would I find the next possible /25 address? It is not the most straightforward thing to do, so think it would be a great enhancement to the ipaddress library.
I think this can be achieved by adding in a new method to the BaseNetwork class, the method could be defined like "next_prefix(next_prefix=None)". Calling this method would return an IPv4/v6 address that is the closest possible match with the new prefix (defined as next_prefix).
Example calls:
v4 = IPv4Network("10.10.0.72/30")
next_network = v4.next_subnet(next_prefix=25)
# Output: next_network = IPv4Network("10.10.0.128/25")
I am going to be working on this and plan to raise a PR soon. This is my first time contributing to Python, so I appreciate your help / comments / suggestions / guidance as I go along.
777GE90 commented on Jan 8, 2021
Not sure how to edit an issue, but I made a mistake, where I said:
"...Calling this method would return an IPv4/v6 address that is the closest possible match..."
I meant to say:
"...Calling this method would return an IPv4/v6 -NETWORK- that is the closest possible match..."
777GE90 commented on Jan 9, 2021
Updated the title and method naming, I previously mentioned the "next subnet" and called the method "next_subnet", but technically this is wrong. What this method should be doing is finding the next closest network of prefix size n.
So I guess the method definition should be:
next_network(self, next_network=None)
777GE90 commented on Feb 8, 2021
Bump :)
orsenthil commented on Jul 8, 2026
Addressed here #24180