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ipaddress - add ability to get next closest network of any prefix size #87027

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ipaddress - add ability to get next closest network of any prefix size#87027
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orsenthil
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3.16new features, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancement

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@777GE90
777GE90
mannequin
opened on Jan 8, 2021
BPO 42861
Nosy @ericvsmith, @777GE90
PRs
  • bpo-42861: Add next_network function to ipaddress library #24180
    		•

    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

    Activity

    1. 777GE90 commented on Jan 8, 2021

      @777GE90
      777GE90mannequin
      on Jan 8, 2021
      MannequinAuthor

      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")

      v4 = IPv4Network("10.10.0.72/30")
next_network = v4.next_subnet(next_prefix=30)
# Output: next_network = IPv4Network("10.10.0.76/30")

v4 = IPv4Network("10.10.0.72/30")
next_network = v4.next_subnet() # if next_prefix is not defined it will use the existing prefix of /30, so this call is exactly the same as the previous
# Output: next_network = IPv4Network("10.10.0.76/30")

v6 = IPv6Network("2001:db8:aaaa:aaaa:aaaa:aaaa:aaaa:0000/112")
next_network = v6.next_subnet()
# Output: next_network = IPv6Network("2001:db8:aaaa:aaaa:aaaa:aaaa:aaab:0/112")

v6 = IPv6Network("2001:db8:aaaa:aaaa:aaaa:aaaa:aaaa:0000/112")
next_network = v6.next_subnet(next_prefix=64)
# Output: next_network = IPv6Network("2001:db8:aaaa:aaab::/64")

      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.

    2. 777GE90
      added
      3.10 (EOL)end of life
      stdlibStandard Library Python modules in the Lib/ directory
      type-featureA feature request or enhancement
      on Jan 8, 2021

    3. 777GE90 commented on Jan 8, 2021

      @777GE90
      777GE90mannequin
      on Jan 8, 2021
      MannequinAuthor

      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..."

    4. 777GE90 commented on Jan 9, 2021

      @777GE90
      777GE90mannequin
      on Jan 9, 2021
      MannequinAuthor

      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)

    5. 777GE90
      changed the title [-]ipaddress - add ability to get next closet subnet of any prefix size[/-] [+]ipaddress - add ability to get next closet network of any prefix size[/+] on Jan 9, 2021

    6. 777GE90 commented on Feb 8, 2021

      @777GE90
      777GE90mannequin
      on Feb 8, 2021
      MannequinAuthor

      Bump :)

    7. merwok
      changed the title [-]ipaddress - add ability to get next closet network of any prefix size[/-] [+]ipaddress - add ability to get next closest network of any prefix size[/+] on Feb 15, 2021
    8. ezio-melotti
      transferred this issue fromon Apr 10, 2022
    9. encukou
      added this to ipaddress issueson Dec 19, 2024
    10. orsenthil
      self-assigned this
      on Jul 8, 2026
    11. orsenthil
      added
      3.16new features, bugs and security fixes
      and removed
      3.10 (EOL)end of life
      on Jul 8, 2026

    12. orsenthil commented on Jul 8, 2026

      @orsenthil
      orsenthil
      on Jul 8, 2026
      Member

      Addressed here #24180

    13. orsenthil
      closed this as completedon Jul 8, 2026
    14. github-project-automation
      moved this to Done in ipaddress issueson Jul 8, 2026
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