A: OPNsense is an open-source firewall and network operating system that provides network security and management features. It is a fork of pfSense and is designed to be a free, customizable alternative for controlling network traffic.

Q: When was OPNsense first released?

A: OPNsense was first released on January 2, 2015, with version 15.1.

Q: What license does OPNsense use?

A: OPNsense is released under the 2-clause BSD License, which allows for free use, modification, and distribution.

Q: What is the relationship between OPNsense and pfSense?

A: OPNsense is a fork of pfSense, meaning it was derived from pfSense's codebase but has since evolved independently with its own features and updates.

Q: Where can I find the source code for OPNsense?

A: The source code for OPNsense is hosted on GitHub at https://github.com/opnsense/.

OPNsense

open-source firewall

CreativeWork network_operating_system Q19348696

Press Enter · cited answer in seconds

Summary

OPNsense is a network operating system^[1]. OPNsense draws 2,412 Wikipedia views per month (network operating system category, ranking #1 of 6).^[2]

Key Facts

Instance of: firewall^[3], open-source software^[4]
Based on: pfSense^[5]
Follows: pfSense^[6]
Copyright license: 2-clause BSD License^[7]
Programmed in: PHP^[8], C^[9]
Software version identifier: 19.7^[10], 15.1^[11], 19.7.2^[12], 19.7.3^[13], 19.7.4^[14], 19.7.5^[15], 19.7.6^[16], 19.7.7^[17], 19.7.8^[18], 19.7.9^[19], 20.1-RC1^[20], 19.7.10^[21], 20.1^[22], 20.1.1^[23]

Why It Matters

OPNsense has Wikipedia articles in 11 language editions, a strong signal of global cultural recognition.^[24] OPNsense is known by 3 alternative names across languages and contexts.^[25]

⭐ Popularity Graph

27/100 established

🌐 Wiki Languages

13 / 427 langs

📈 Wikipedia Views · last 434h

2.4K/mo 12.2K/yr

🔗 Readers Also Explored · clickstream

pfSense

405

m0n0wall

175

FreeBSD

109

next-generation firewall

traffic shaping

OpenWrt

Quick Facts

Instance of network operating system, firewall, open-source software

Inception January 2, 2015

Follows pfSense

Official website opnsense.org

Based on pfSense

Properties

Depends on software FreeBSD

Official blog url opnsense.org

Official donation page url opnsense.org

Official forum url forum.opnsense.org

Platform x86-64

Programmed in PHP, C

Social media followers 15k (9.4k–15k, n=4)

Software version identifier 19.7, 15.1, 19.7.2, 19.7.3, 19.7.4, 19.7.5, 19.7.6, 19.7.7, 19.7.8, 19.7.9, 20.1-RC1, 19.7.10, 20.1, 20.1.1, 20.1.2, 20.1.3, 20.1.4, 20.1.5, 20.1.6, 20.1.7, 20.1.8, 20.7, 20.7.1, 20.7.2, 20.7.3, 20.7.4, 20.7.5, 20.7.6, 20.7.7, 21.1, 21.1.1, 20.7.8, 21.1.2, 21.1.3, 21.1.4, 21.1.5, 21.1.6, 21.1.7, 21.1.8, 21.1.9, 21.7, 21.7.1, 21.7.2, 21.7.3, 21.7.4, 21.7.5, 21.7.6, 21.7.7, 21.7.8, 22.1, 22.1.1, 22.1.2, 22.1.3, 22.1.4, 22.1.5, 22.1.6, 22.1.7, 22.1.8, 22.1.9, 22.1.10, 22.7.0, 22.7.1, 22.7.2, 22.7.3, 22.7.4, 22.7.5, 22.7.6, 22.7.7, 22.7.8, 22.7.9, 22.7.10, 22.7.11, 23.1, 23.1.1, 23.1.2, 23.1.3, 23.1.4, 23.1.5, 23.1.6, 23.1.7, 23.1.8, 23.1.9, 23.1.10, 23.1.11, 23.7, 23.7.1, 23.7.2, 23.7.3, 23.7.4, 23.7.5, 23.7.6, 23.7.7, 23.7.8, 23.7.9, 23.7.10, 23.7.11, 23.7.12, 24.1, 24.1.1, 24.1.2, 24.1.3, 24.1.4, 24.1.5, 24.1.6, 24.1.7, 24.1.8, 24.1.9, 24.1.10, 24.7, 24.7.1, 24.7.2, 24.7.3, 24.7.4, 24.7.5, 24.7.6, 24.7.7, 24.7.8, 24.7.9, 24.7.10, 24.7.11, 24.7.12, 25.1, 25.1.1, 25.1.2, 25.1.3, 25.1.4, 25.1.5, 25.1.6, 25.1.7, 25.1.8, 25.1.9, 25.1.10, 25.1.11, 25.1.12, 25.7, 25.7.1, 25.7.2, 25.7.3, 25.7.4, 25.7.5, 25.7.6, 25.7.7, 25.7.8, 25.7.9, 25.7.10, 25.7.11, 26.1, 26.1.1, 26.1.2, 26.1.3, 26.1.4, 26.1.5, 26.1.6, 26.1.7, 26.1.8, 26.1.9, 26.1.10, 26.1.11, 26.7, 26.7.1, 26.7.2, 26.7.3, 26.7.4, 26.7.5, 26.7.6, 26.7.7

Source code repository url github.com

Stack exchange tag stackoverflow.com

External References (13)

Alternativeto software id opnsense

Distrowatch id opnsense

Freebase id /m/012w3pzs

Github account opnsense

Gitlab topic id Opnsense

Gnd id 1169794319

Itu/iso/iec object id 1.3.6.1.4.1.53869

Lemmy community id opnsense@lemmy.world

Open hub id opnsense

Private enterprise number 53869

Pro-linux.de dbapp id 20953

Subreddit OPNsenseFirewall

X (twitter) username opnsense

🌐 Available in 11 languages

enOPNsense arأوبن سينس deOPNsense esOPNsense hiओपनसेंस koOPNsense nlOPNsense plOPNsense ptOPNsense ruOPNsense zhOPNsense

🏷️ Also known as

en OPNsense ar أوبن سينس hi ओपनसेंस

🔗 Connections

Instance of 3

firewall, open-source software, network operating system

Based on 1

pfSense

2-clause BSD License

Depends on software 1

FreeBSD

Follows 1

pfSense

Preceded by (successor) 1

pfSense

Programmed in 1

PHP

← Derivative work 1

pfSense

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). OPNsense. Retrieved October 15, 2026, from https://4ort.xyz/entity/opnsense

MLA “OPNsense.” 4ort.xyz Knowledge Graph, 4ort.xyz, 15 Oct. 2026, https://4ort.xyz/entity/opnsense.

BibTeX

@misc{4ortxyz_opnsense_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{OPNsense}}, year = {2026}, url = {https://4ort.xyz/entity/opnsense}, note = {Accessed: 2026-10-15}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): OPNsense — https://4ort.xyz/entity/opnsense (retrieved 2026-10-15)

Canonical URL: https://4ort.xyz/entity/opnsense · Last refreshed: October 15, 2026

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

19h ago · MeltdownSpectre · 2026-10-15 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

Claims rich → —

"/* wbsetclaim-create:2||1 */ Software version identifier: 26.7.7"
7d ago · MeltdownSpectre · 2026-10-08 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

Sitelink count → 13

Wikipedia languages → ['ar', 'commons', 'de', 'en', 'es', 'fr', 'hi', 'ko', 'nl', 'pl', 'pt', 'ru', 'z

Claims rich → —

"/* wbsetclaim-update:2||1 */ Software version identifier: 26.7.5"
15d ago · MeltdownSpectre · 2026-09-30 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

Gnd id → 1169794319

Claims rich → —

"/* wbsetclaim-update:2||1 */ Software version identifier: 26.7.4"
4w ago · MeltdownSpectre · 2026-09-15 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

"/* wbsetclaim-create:2||1 */ Software version identifier: 26.7.4"
12w ago · MeltdownSpectre · 2026-07-23 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

"/* wbsetclaim-update:2||1 */ Software version identifier: 26.7"
17w ago · DanGFSouza · 2026-06-18 view diff on Wikidata ↗

Subreddit → OPNsenseFirewall

"/* wbsetclaim-create:1||1 */ Subreddit: OPNsenseFirewall, Matched to [[:toollabs:mix-n-match/#/entry/144664584|OPNsenseFirewall (#144664584)]] in [[:toollabs:mix-n-match/#/catalog/5569|Subred"
17w ago · MeltdownSpectre · 2026-06-15 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

"/* wbsetclaim-update:2||1 */ Software version identifier: 26.1.9"
18w ago · ~2026-34255-02 · 2026-06-10 view diff on Wikidata ↗

Source code repository url → https://github.com/opnsense

"/* wbsetclaim-update:2||1 */ Source code repository url: https://github.com/opnsense"
19w ago · MeltdownSpectre · 2026-06-02 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

"/* wbsetclaim-update:2||1 */ Software version identifier: 26.1.8"
20w ago · Mormegil · 2026-05-29 view diff on Wikidata ↗

Software version identifier → 19.7, 15.1, 19.7.2 +163

Itu/iso/iec object id → 1.3.6.1.4.1.53869

"/* wbsetclaim-create:2||1 */ Itu/iso/iec object id: 1.3.6.1.4.1.53869, Adding OID according to PEN ([[:toollabs:editgroups/b/CB/d2618c181fded330f92a|details]])"
24w ago · MeltdownSpectre · 2026-05-01 view diff on Wikidata ↗

Platform → x86-64

Copyright status → —

Source code repository url → https://github.com/opnsense

Private enterprise number → 53869

+ 56 other properties edited (see Wikidata diff for full list)

"/* wbsetclaim-update:2||1 */ Software version identifier: 26.1.6"

Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.

OPNsense

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