Company lists · Data verified August 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 Verified Aug 28, 2026 365 companies tracked

There are 365 defense cybersecurity companies headquartered in Australia (RevenueBase, August 2026). RevenueBase 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. Data current as of August 28, 2026.

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 verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	PT Itsec Asia TBK	Melbourne	201-500	387	67
2	Centorrino Technologies	Coburg	201-500	349	207
3	Webroot	Chatswood	501-1,000	199	75
4	Aurizn	Adelaide	201-500	157	114
5	Triskele Labs	Melbourne	51-200	123	89
6	Secutec	Sydney	51-200	102	37
7	Consunet PTY LTD	Adelaide	51-200	99	74
8	Kaine Mathrick Tech	Sydney	51-200	91	62
9	Informatech PTY LTD	Canberra	51-200	90	36
10	Northbridge Systems	St Leonards	51-200	70	27
11	C4i	Melbourne	51-200	59	27
12	RED Piranha	Melbourne	51-200	58	41
13	Ipsec PTY LTD	Cremorne	11-50	57	35
14	Deploypartners	North Sydney	51-200	51	24
15	Wipro Shelde	Melbourne	51-200	50	15
16	Dimiya Tech	Melbourne	51-200	50	2
17	Sekuro Asia	Brisbane	51-200	43	11
18	Slipstream Cyber	St Leonards	11-50	42	28
19	Firstwave ASX FCT	North Sydney	51-200	42	26
20	Cythera	Cbd	11-50	42	26
21	Seccom Global	Sydney	11-50	41	30
22	Bluerydge	Fyshwick	51-200	39	28
23	Astralas	Cremorne	51-200	35	20
24	Ionize	Canberra	51-200	34	26
25	OP Innovate	Canberra	11-50	34	21

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 Aug 28, 2026

1-10Median size (employees)

SydneyLargest hub · 73 HQs

257Contacts with mobile numbers

2Emails re-verified in last 30 days

Companies by employee count

1-10

208

11-50

115

51-200

201-500

501-1,000

Defense cybersecurity companies by metro

Metro	Companies
Defense cybersecurity companies in Sydney	73
Defense cybersecurity companies in Melbourne	71
Defense cybersecurity companies in Brisbane	34
Defense cybersecurity companies in Canberra	28
Defense cybersecurity companies in Adelaide	17
Defense cybersecurity companies in Perth	16
Defense cybersecurity companies in Brisbane City	10

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “defense cybersecurity companies”, with match quality audited by blind human judging, and headquartered in Australia.
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: Contact records re-verify on a rolling cadence; 2 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many defense cybersecurity companies are there based in Australia?

There are 365 defense cybersecurity companies headquartered in Australia as of August 2026 (RevenueBase).

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 is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.