prefixes - store if prefix is public or private or other ip-space - allow filtering by ip space class #201

New Issue

MrUnknownDE · 2026-04-05T16:22:56+02:00

MrUnknownDE commented

2026-04-05 16:22:56 +02:00

Originally created by @ITJamie on 3/6/2026

NetBox version

v4.5.4

Feature type

Data model extension

Proposed functionality

when a prefix is created. calculate the prefix class and store it in a new field. allow filtering of prefixes by that new field. if not in the list below it should be considered Public

Private / internal addressing
	•	RFC1918 – Private IPv4 address space
	•	10.0.0.0/8
	•	172.16.0.0/12
	•	192.168.0.0/16

Carrier-grade NAT
	•	RFC6598 – Shared Address Space
	•	100.64.0.0/10

Loopback
	•	RFC1122 – IPv4 Loopback
	•	127.0.0.0/8

Link-local
	•	RFC3927 – IPv4 Link-Local
	•	169.254.0.0/16
	•	RFC4291 – IPv6 Link-Local
	•	fe80::/10

Documentation ranges
	•	RFC5737 – IPv4 Documentation Prefixes
	•	192.0.2.0/24
	•	198.51.100.0/24
	•	203.0.113.0/24
	•	RFC3849 – IPv6 Documentation Prefix
	•	2001:db8::/32

Multicast
	•	RFC5771 – IPv4 Multicast
	•	224.0.0.0/4
	•	RFC4291 – IPv6 Multicast
	•	ff00::/8

Benchmarking
	•	RFC2544 – Benchmark testing network
	•	198.18.0.0/15

Reserved / special use
	•	RFC6890 – Special-purpose IP address registries

Use case

When searching netbox prefixes it would be useful to be able to quickly filter down to types of addresses.

Eg during a recent audit of all prefixes. we wanted to be able to easily filter down to just public ranges to make sure all active public prefixes had a tenant assigned.

instead of a single search we had to do multiple rounds of searchs with the our public prefix container as the parent search

Database changes

add a read-only field eg "ip_space_class" or similar

backfill it in with a migration

import ipaddress

net = ipaddress.ip_network(prefix)

if net.is_private:
    ip_space_class = "private"
elif net.is_global:
    ip_space_class = "public"
elif net.is_loopback:
    ip_space_class = "loopback"
elif net.is_link_local:
    ip_space_class = "link_local"
elif net.is_multicast:
    ip_space_class = "multicast"

External dependencies

n/a

*Originally created by @ITJamie on 3/6/2026* ### NetBox version v4.5.4 ### Feature type Data model extension ### Proposed functionality when a prefix is created. calculate the prefix class and store it in a new field. allow filtering of prefixes by that new field. if not in the list below it should be considered Public ``` Private / internal addressing • RFC1918 – Private IPv4 address space • 10.0.0.0/8 • 172.16.0.0/12 • 192.168.0.0/16 Carrier-grade NAT • RFC6598 – Shared Address Space • 100.64.0.0/10 Loopback • RFC1122 – IPv4 Loopback • 127.0.0.0/8 Link-local • RFC3927 – IPv4 Link-Local • 169.254.0.0/16 • RFC4291 – IPv6 Link-Local • fe80::/10 Documentation ranges • RFC5737 – IPv4 Documentation Prefixes • 192.0.2.0/24 • 198.51.100.0/24 • 203.0.113.0/24 • RFC3849 – IPv6 Documentation Prefix • 2001:db8::/32 Multicast • RFC5771 – IPv4 Multicast • 224.0.0.0/4 • RFC4291 – IPv6 Multicast • ff00::/8 Benchmarking • RFC2544 – Benchmark testing network • 198.18.0.0/15 Reserved / special use • RFC6890 – Special-purpose IP address registries ``` ### Use case When searching netbox prefixes it would be useful to be able to quickly filter down to types of addresses. Eg during a recent audit of all prefixes. we wanted to be able to easily filter down to just public ranges to make sure all active public prefixes had a tenant assigned. instead of a single search we had to do multiple rounds of searchs with the our public prefix container as the parent search ### Database changes add a read-only field eg "ip_space_class" or similar backfill it in with a migration ``` import ipaddress net = ipaddress.ip_network(prefix) if net.is_private: ip_space_class = "private" elif net.is_global: ip_space_class = "public" elif net.is_loopback: ip_space_class = "loopback" elif net.is_link_local: ip_space_class = "link_local" elif net.is_multicast: ip_space_class = "multicast" ``` ### External dependencies n/a

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21455-sql-indexes-audit

21357-register-model-actions

feature

20924-plugin-ui-components

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

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21025-pre-render-config-contexts

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feature-ip-prefix-link

20911-dropdown-3

fix_module_substitution

21160-filterset

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7604-filter-modifiers-v3

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19275-fixes-interface-bulk-edit

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Reference: github/netbox#201