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IP prefix, when nest a /30 into a /29 the subnetID and Broadcast ID are available for IP assignment in the /29 prefix #8494

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opened 2025-12-29 20:37:25 +01:00 by adam · 1 comment
adam commented 2025-12-29 20:37:25 +01:00
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Originally created by @Taz86 on GitHub (Aug 22, 2023).

NetBox version

V3.5.8

Python version

3.11

Steps to Reproduce

Example:
Go to IPAM and create some prefixes

  • Create /29 prefix 10.0.0.0/29
  • Create 2x /30 prefix 10.0.0.0/30 and 10.0.0.4/30 (no pool)
  • Assign 2 available IP adresses in both /30 prefixes

Expected Behavior

Expect:
/29 is full, no available IP adresses

Observed Behavior

Result:
10.0.0.3 and 10.10.0.4 are available for assignment

Originally created by @Taz86 on GitHub (Aug 22, 2023). ### NetBox version V3.5.8 ### Python version 3.11 ### Steps to Reproduce Example: Go to IPAM and create some prefixes - Create /29 prefix 10.0.0.0/29 - Create 2x /30 prefix 10.0.0.0/30 and 10.0.0.4/30 (no pool) - Assign 2 available IP adresses in both /30 prefixes ### Expected Behavior Expect: /29 is full, no available IP adresses ### Observed Behavior Result: 10.0.0.3 and 10.10.0.4 are available for assignment
adam closed this issue 2025-12-29 20:37:25 +01:00
adam commented 2025-12-29 20:37:26 +01:00
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@jeremystretch commented on GitHub (Aug 23, 2023):

This is expected behavior: The "IP addresses" tab under the parent prefix is showing what IPs are available within the context of that prefix, regardless of its child assignments. There are many scenarios where this is useful and necessary.

@jeremystretch commented on GitHub (Aug 23, 2023): This is expected behavior: The "IP addresses" tab under the parent prefix is showing what IPs are available within the context of _that_ prefix, regardless of its child assignments. There are many scenarios where this is useful and necessary.
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Reference: starred/netbox#8494
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