Prefix Available IPs behaviour changed #1455

New Issue

MrUnknownDE · 2026-04-06T01:49:51+02:00

MrUnknownDE commented

2026-04-06 01:49:51 +02:00

Originally created by @yarnocobussen-sbp on 8/14/2025

Deployment Type

Self-hosted

NetBox Version

v4.3.5

Python Version

3.12

Steps to Reproduce

Create a prefix 10.0.0.0/24
Create an ip-range 10.0.0.1-9/24
POST [{"status": "active"}] to /api/ipam/prefixes/{id}/available-ips/

Expected Behavior

An IP Address 10.0.0.10/24 will be created.

Observed Behavior

An IP Address 10.0.0.1/24 is created.

Available IP Addresses within IP Ranges used to not be considered when calling /api/ipam/prefixes/{id}/available-ips/.
My last test for the expected behavior was in Netbox v4.1.11.
You had to explicitly call /api/ipam/ip-ranges/{id}/available-ips/ to create an address inside an IP Range.

I cannot find anything a mention of this in patch notes or issues, but I believe the changes for the fully utilized property on IP Ranges may have influenced this behaviour. (Please point me to an issue if I've missed something)

Reproducing the old behavior for /api/ipam/prefixes/{id}/available-ips/. seems to only be possible now by setting fully utilised to true for each IP Range within the Prefix, but that also causes you to be unable to now provision addresses into said IP Ranges.

The workaround is to first lookup IP Ranges for a Prefix, set them all to fully utilized, provision your IP Address, and then revert the changes to the IP Ranges. However, that's a bit strange and leads to change logs on IP Range objects every time you want to provision an IP Address.

Is there anything I'm missing? Is this intended behaviour or not? It breaks our provisioning logic.

*Originally created by @yarnocobussen-sbp on 8/14/2025* ### Deployment Type Self-hosted ### NetBox Version v4.3.5 ### Python Version 3.12 ### Steps to Reproduce 1. Create a prefix 10.0.0.0/24 2. Create an ip-range 10.0.0.1-9/24 3. POST [{"status": "active"}] to /api/ipam/prefixes/{id}/available-ips/ ### Expected Behavior An IP Address 10.0.0.10/24 will be created. ### Observed Behavior An IP Address 10.0.0.1/24 is created. Available IP Addresses within IP Ranges used to not be considered when calling /api/ipam/prefixes/{id}/available-ips/. My last test for the expected behavior was in Netbox v4.1.11. You had to explicitly call /api/ipam/ip-ranges/{id}/available-ips/ to create an address inside an IP Range. I cannot find anything a mention of this in patch notes or issues, but I believe the changes for the fully utilized property on IP Ranges may have influenced this behaviour. (Please point me to an issue if I've missed something) Reproducing the old behavior for /api/ipam/prefixes/{id}/available-ips/. seems to only be possible now by setting fully utilised to true for each IP Range within the Prefix, but that also causes you to be unable to now provision addresses into said IP Ranges. The workaround is to first lookup IP Ranges for a Prefix, set them all to fully utilized, provision your IP Address, and then revert the changes to the IP Ranges. However, that's a bit strange and leads to change logs on IP Range objects every time you want to provision an IP Address. Is there anything I'm missing? Is this intended behaviour or not? It breaks our provisioning logic.

MrUnknownDE closed this issue

2026-04-06 01:49:51 +02:00

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Branches Tags

main

21455-sql-indexes-audit

21357-register-model-actions

feature

20924-plugin-ui-components

21766-improve-test-coverage-for-sortable-table-columns

21157-export-template-public-models

21025-pre-render-config-contexts

21364-swagger

feature-ip-prefix-link

20911-dropdown-3

fix_module_substitution

21160-filterset

20911-dropdown-2

20044-elevation-stuck-lightmode

7604-filter-modifiers-v3

20660-script-load

19724-graphql

14884-script

19720-macaddress-interface-generic-relation

fix-19669-api-image-download

7604-filter-modifiers

19275-fixes-interface-bulk-edit

fix-17794-get_field_value_return_list

11507-show-aggregate-and-rir-on-api

9583-add_column_specific_search_field_to_tables

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Due Date

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Dependencies

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Reference: github/netbox#1455