Company lists · Data refreshed September 2026

Top 25 Internet security companies based in Australia

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 74 companies tracked

RevenueBase identified 74 internet security companies headquartered in Australia as of September 2026 and tracks 429 professional contacts across them, including 164 with verified work emails. Sydney is the largest hub.

This list covers internet security 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 21, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

74Companies

429Contacts tracked

164Verified emails

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The 25 largest internet security companies based in Australia

Ranked by team size

Top 25 of 74 internet security companies based in Australia, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to internet security 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	Defencebyte	Partial evidence	Toongabbie, AustraliaHQ checked Sep 21, 2026	11-50	46 contacts →
	Partial evidence “defencebyte is a big name among the PC security providers.” Source: RevenueBase Database · checked Sep 21, 2026
2	Ionize	Partial evidence	Canberra, AustraliaHQ checked Sep 21, 2026	51-200	35 contacts →
	Partial evidence “When it comes to security there's no shortage of companies ready to tell you about your vulnerabilities.” Source: RevenueBase Database · checked Sep 21, 2026
3	Cyberxcel	Indirect evidence	Brisbane, AustraliaHQ checked Sep 21, 2026	n/a	33 contacts →
	Indirect evidence “Founded by Sohail Ershadi, a distinguished cybersecurity expert with over a decade of experience in the IT industry, CyberXcel has rapidly emerged as a leader in cybersecurity…” Source: RevenueBase Database · checked Sep 21, 2026
4	Wontok	Partial evidence	Pyrmont, AustraliaHQ checked Sep 21, 2026	51-200	20 contacts →
	Partial evidence “Wontok delivers proven data security solutions that when activated render malware inoperable.” Source: RevenueBase Database · checked Sep 21, 2026
5	Spartans Security	Indirect evidence	Cremorne, AustraliaHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “Facing the Complexities of Cybersecurity?” Source: RevenueBase Database · checked Sep 21, 2026
6	Eset Australia	Indirect evidence	North Sydney, AustraliaHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “For more than 30 years we have been here helping to watch over and protect progress.” Source: RevenueBase Database · checked Sep 21, 2026
7	Secured Enterprise	Partial evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	51-200	12 contacts →
	Partial evidence “Secured Enterprise is a globally recognized pioneer in online cyber security that collaborate with businesses in Australia, Europe, South Africa, North America, and New Zealand.” Source: RevenueBase Database · checked Sep 21, 2026
8	Cleared	Partial evidence	Canberra, AustraliaHQ checked Sep 21, 2026	11-50	11 contacts →
	Partial evidence “Security simplified.” Source: RevenueBase Database · checked Sep 21, 2026
9	Datasec Solutions PTY LTD	Partial evidence	Nunawading, AustraliaHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “Datasec Solutions is a cybersecurity software company that focuses on securing workflow solutions, communication channels, and edge devices.” Source: RevenueBase Database · checked Sep 21, 2026
10	Zirilio	Indirect evidence	Sydney, AustraliaHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “With ZIRILIO on your side, the digital world just became safer.” Source: RevenueBase Database · checked Sep 21, 2026
11	Networx Australia	Strong evidence	Waterloo, AustraliaHQ checked Sep 21, 2026	11-50	10 contacts →
	Strong evidence “Networx Australia are Internet Security Experts, providing a wealth of experience and expertise in designing, configuring and implementing the major brands of Internet Security…” Source: RevenueBase Database · checked Sep 21, 2026
12	Cyber Audit Team	Partial evidence	South East Queensland, AustraliaHQ checked Sep 21, 2026	11-50	9 contacts →
	Partial evidence “Cyber Audit Team is a leading multi-disciplinary Australian cyber security company offering holistic 'end-to-end' solutions, ensuring that our clients' businesses are operating in…” Source: RevenueBase Database · checked Sep 21, 2026
13	Cyberhub Group	Partial evidence	Sydney, AustraliaHQ checked Sep 21, 2026	11-50	9 contacts →
	Partial evidence “CyberHub was established with the aim of making Cyber Security more available to companies of all sizes.” Source: RevenueBase Database · checked Sep 21, 2026
14	Shadowsafe	Partial evidence	Norman Park, AustraliaHQ checked Sep 21, 2026	1-10	8 contacts →
	Partial evidence “ShadowSafe is a cyber security and IT services company based in Brisbane that protects Australian businesses from a wide range of digital threats including cyber attacks, data…” Source: RevenueBase Database · checked Sep 21, 2026
15	Databl	Partial evidence	Perth, AustraliaHQ checked Sep 21, 2026	11-50	5 contacts →
	Partial evidence “MANAGED IT AND SECURITY (MSP / MSSP) Fully managed technology and 24/7 security operations for growing businesses, organisations running real infrastructure and real risk…” Source: RevenueBase Database · checked Sep 21, 2026
16	Shearwater Solutions	Indirect evidence	Chatswood, AustraliaHQ checked Sep 21, 2026	51-200	5 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
17	D2unet PTY LTD	Indirect evidence	Sydney, AustraliaHQ checked Sep 21, 2026	1-10	5 contacts →
	Indirect evidence “At D2UNet, we take a multi-faceted approach to cybersecurity.” Source: RevenueBase Database · checked Sep 21, 2026
18	Sapien Cyber	Indirect evidence	Joondalup, AustraliaHQ checked Sep 21, 2026	11-50	3 contacts →
	Indirect evidence “Sapien Cyber is an Australian company providing class-leading cybersecurity and threat intelligence solutions for the protection of critical infrastructure.” Source: RevenueBase Database · checked Sep 21, 2026
19	Sicarius	Partial evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	1-10	3 contacts →
	Partial evidence “Sicarius is an Australian cybersecurity firm offering three services: Beacon, a continuous security posture monitoring platform for Australian AFFORDABILITY TAILORED FOR SMALL…” Source: RevenueBase Database · checked Sep 21, 2026
20	Lithnet	Indirect evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	11-50	3 contacts →
	Indirect evidence “We believe that the current IT threat landscape is heavily favored towards the bad actor; having access to thousands of easily accessible options that can be deployed with minimal…” Source: RevenueBase Database · checked Sep 21, 2026
21	AGIX	Indirect evidence	Parkside, AustraliaHQ checked Sep 21, 2026	11-50	3 contacts →
	Indirect evidence “Discovery & Remediation are at the heart of our approach to organisational cybersecurity services AGIX is a leading cybersecurity and IT solutions provider based in Adelaide…” Source: RevenueBase Database · checked Sep 21, 2026
22	Stratus Security	Indirect evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	1-10	3 contacts →
	Indirect evidence “In a world where the digital landscape is constantly evolving and cyber threats are becoming increasingly sophisticated, it's crucial for organizations to be proactive in…” Source: RevenueBase Database · checked Sep 21, 2026
23	Cyberguru	Indirect evidence	Brisbane, AustraliaHQ checked Sep 21, 2026	1-10	2 contacts →
	Indirect evidence “Business Without Interruption™ Partnering with CyberGuru means you can benefit from our extensive experience, industry-leading tools and technologies, and our unwavering…” Source: RevenueBase Database · checked Sep 21, 2026
24	Dgplex	Partial evidence	Canberra, AustraliaHQ checked Sep 21, 2026	1-10	2 contacts →
	Partial evidence “DGplex is an Australian Sovereign Canberra based highly specialised Cyber Security Company founded by Jordan Del-Grande in 2019.” Source: RevenueBase Database · checked Sep 21, 2026
25	Southern Cyber	Indirect evidence	Adelaide, AustraliaHQ checked Sep 21, 2026	11-50	2 contacts →
	Indirect evidence “At Southern Cyber, our mission is to provide high-level cybersecurity solutions that empower organisations of all sizes.” Source: RevenueBase Database · checked Sep 21, 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: internet security 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 internet security companies.
Partial evidence: Its own public description names part of internet security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name internet security 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 74 internet security companies based in Australia

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Internet security companies based in Australia at a glance

As of Sep 21, 2026

38.2%Verified-email coverage

5.8Average contacts per company

1-10Median size (employees)

20.3%Largest-city concentration · Sydney

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured worldwide rather than for Australia, so it is reported there. Company counts and contact totals on this page are exact for Australia, over 74 companies.

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 internet security 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 “internet security 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 internet security 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 internet security 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, 164 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 21, 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.

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 internet security 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 internet security companies are there based in Australia?

RevenueBase identified 74 internet security 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?

Defencebyte, headquartered in Toongabbie, tops this list with the largest team on record.

Which city has the most internet security companies?

Sydney leads with 15 headquartered companies, followed by Melbourne (12) and Brisbane (5).

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 164 verified decision-maker contacts tracked across these 74 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 21, 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.