Company lists · Data refreshed September 2026

Top 25 Defense cybersecurity companies based in Australia

Name: Defense cybersecurity companies based in Australia
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 365 companies tracked

RevenueBase identified 365 defense cybersecurity companies headquartered in Australia as of September 2026 and tracks 4,441 professional contacts across them, including 1,812 with verified work emails and 257 with mobile numbers. Sydney is the largest hub.

This list covers defense cybersecurity companies headquartered in Australia, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

365Companies

4,441Contacts tracked

1,812Verified emails

257Mobile numbers

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The 25 largest defense cybersecurity companies based in Australia

Ranked by team size

Top 25 of 365 defense cybersecurity companies based in Australia, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to defense cybersecurity companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	PT Itsec Asia TBK	Partial evidence	Melbourne, Australia	201-500	387 contacts →
	Partial evidence “ITSEC Asia is a leading cybersecurity company in Indonesia, listed on the Indonesian Stock Exchange (“CYBR”), with over 400 employees across five countries.” Source: RevenueBase Database · checked Sep 1, 2026
2	Centorrino Technologies	Indirect evidence	Coburg, Australia	201-500	349 contacts →
	Indirect evidence “We are an Australian-owned, full-service ICT Solutions and Cyber Security provider with a locally based team of over 450 passionate Aussies.” Source: RevenueBase Database · checked Sep 1, 2026
3	Webroot	Indirect evidence	Chatswood, Australia	501-1,000	199 contacts →
	Indirect evidence “Webroot, an OpenText company, was the first to harness the cloud and artificial intelligence to stop zero-day threats in real time.” Source: RevenueBase Database · checked Sep 1, 2026
4	Aurizn	Partial evidence	Adelaide, Australia	201-500	157 contacts →
	Partial evidence “Servicing Defence and Enterprise with our unique expertise in #AI, Advanced Sensing and #Simulation, Aurizn’s purpose is to push the boundaries of the known to create a more…” Source: RevenueBase Database · checked Sep 1, 2026
5	Triskele Labs	Partial evidence	Melbourne, Australia	51-200	123 contacts →
	Partial evidence “Triskele Labs is one of Australia’s fastest growing cybersecurity companies.” Source: RevenueBase Database · checked Sep 1, 2026
6	Secutec	Partial evidence	Sydney, Australia	51-200	102 contacts →
	Partial evidence “Cybersecurity company Secutec was founded in 2005 and is considered an authority in the field of cybersecurity, threat intelligence, and incident response services tailored to…” Source: RevenueBase Database · checked Sep 1, 2026
7	Consunet PTY LTD	Indirect evidence	Adelaide, Australia	51-200	99 contacts →
	Indirect evidence “Consunet is 100% Australian-owned and operated, with 20 years of market participation resulting in capability and capacity to lead major projects as a trusted industry partner to…” Source: RevenueBase Database · checked Sep 1, 2026
8	Kaine Mathrick Tech	Indirect evidence	Sydney, Australia	51-200	91 contacts →
	Indirect evidence “Australia’s cyber-first Managed Service Provider and true technology partner.” Source: RevenueBase Database · checked Sep 1, 2026
9	Informatech PTY LTD	Partial evidence	Canberra, Australia	51-200	90 contacts →
	Partial evidence “Informatech is a veteran led business and specialises in ICT within Defence.” Source: RevenueBase Database · checked Sep 1, 2026
10	Northbridge Systems	Partial evidence	St Leonards, Australia	51-200	70 contacts →
	Partial evidence “Northbridge is an Australian-owned cybersecurity services provider with more than 25 years’ experience delivering engineered, integrated and fully managed security services to…” Source: RevenueBase Database · checked Sep 1, 2026
11	C4i	Indirect evidence	Melbourne, Australia	51-200	59 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 1, 2026
12	RED Piranha	Strong evidence	Melbourne, Australia	51-200	58 contacts →
	Strong evidence “Australia’s leading developer and manufacturer of advanced cybersecurity technology, Red Piranha delivers next-generation cyber defence solutions designed to protect modern…” Source: RevenueBase Database · checked Sep 1, 2026
13	Ipsec PTY LTD	Indirect evidence	Cremorne, Australia	11-50	57 contacts →
	Indirect evidence “IPSec are specialists in information asset and cyber protection; security experts who know how to mitigate cyber risk by assisting in the protection of valuable intelligence…” Source: RevenueBase Database · checked Sep 1, 2026
14	Deploypartners	Indirect evidence	North Sydney, Australia	51-200	51 contacts →
	Indirect evidence “DeployPartners offer unique values and benefits that enable our clients and partners to differentiate on customer service.” Source: RevenueBase Database · checked Sep 1, 2026
15	Wipro Shelde	Indirect evidence	Melbourne, Australia	51-200	50 contacts →
	Indirect evidence “Our mission is to help our clients protect their assets, reputation, and customers from cyber threats, while also enabling them to embrace digital transformation and innovation…” Source: RevenueBase Database · checked Sep 1, 2026
16	Dimiya Tech	Partial evidence	Melbourne, Australia	51-200	50 contacts →
	Partial evidence “DIMIYA Tech is a Melbourne, Australia based- global Cybersecurity and IT services provider supporting organizations that require secure, scalable, and high-performance technology…” Source: RevenueBase Database · checked Sep 1, 2026
17	Sekuro Asia	Partial evidence	Brisbane, Australia	51-200	43 contacts →
	Partial evidence “Sekuro is a leading global cybersecurity provider that helps clients and partners strategically mitigate cyber risks and build resilient businesses.” Source: RevenueBase Database · checked Sep 1, 2026
18	Slipstream Cyber	Indirect evidence	St Leonards, Australia	11-50	42 contacts →
	Indirect evidence “Slipstream Cyber is a business of Interactive - Australia's leading technology solutions provider.” Source: RevenueBase Database · checked Sep 1, 2026
19	Firstwave ASX FCT	Partial evidence	North Sydney, Australia	51-200	42 contacts →
	Partial evidence “FirstWave is a global cybersecurity technology company formed in 2004.” Source: RevenueBase Database · checked Sep 1, 2026
20	Cythera	Indirect evidence	Cbd, Australia	11-50	42 contacts →
	Indirect evidence “Cythera’s cyber security solutions allow for the rapid deployment of Assessment, Protection, Monitoring & Response and Assurance technologies to meet the security needs of…” Source: RevenueBase Database · checked Sep 1, 2026
21	Seccom Global	Indirect evidence	Sydney, Australia	11-50	41 contacts →
	Indirect evidence “Seccom Global - The Cyber Security Company Providing excellence in service to educate, connect and protect your business Founded in 2003, Seccom Global is recognised as a leader…” Source: RevenueBase Database · checked Sep 1, 2026
22	Bluerydge	Partial evidence	Fyshwick, Australia	51-200	39 contacts →
	Partial evidence “Bluerydge delivers mission-secure capability, specialising in Cybersecurity, Technology, Artificial Intelligence (AI), and Robotics.” Source: RevenueBase Database · checked Sep 1, 2026
23	Astralas	Indirect evidence	Cremorne, Australia	51-200	35 contacts →
	Indirect evidence “Good people solving important problems.” Source: RevenueBase Database · checked Sep 1, 2026
24	Ionize	Indirect evidence	Canberra, Australia	51-200	34 contacts →
	Indirect evidence “When it comes to security there's no shortage of companies ready to tell you about your vulnerabilities.” Source: RevenueBase Database · checked Sep 1, 2026
25	OP Innovate	Strong evidence	Canberra, Australia	11-50	34 contacts →
	Strong evidence “Established in 2014 to defend global enterprises from the increasing challenges of organizational cybersecurity.” Source: RevenueBase Database · checked Sep 1, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: defense cybersecurity companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names defense cybersecurity companies.
Partial evidence: Its own public description names part of defense cybersecurity companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name defense cybersecurity companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 365 defense cybersecurity companies based in Australia

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Defense cybersecurity companies based in Australia at a glance

As of Sep 1, 2026

40.8%Verified-email coverage

5.8%Mobile-number coverage

12.2Average contacts per company

1-10Median size (employees)

20.0%Largest-city concentration · Sydney

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

208

11-50

115

51-200

201-500

501-1,000

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among defense cybersecurity companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Australia whose own description of what they do matches “defense cybersecurity companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names defense cybersecurity companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among defense cybersecurity companies, and records with no verified work email. Companies headquartered outside Australia are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 1,812 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 1, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Defense cybersecurity companies by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names defense cybersecurity companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many defense cybersecurity companies are there based in Australia?

RevenueBase identified 365 defense cybersecurity companies headquartered in Australia as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

PT Itsec Asia TBK, headquartered in Melbourne, tops this list with the largest team on record.

Which city has the most defense cybersecurity companies?

Sydney leads with 73 headquartered companies, followed by Melbourne (71) and Brisbane (34).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,812 verified decision-maker contacts tracked across these 365 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 1, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.