Company lists · Data refreshed September 2026

Top 25 Penetration testing firms based in Sydney, Australia

Name: Penetration testing firms based in Sydney, Australia
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 86 companies tracked

RevenueBase identified 86 penetration testing firms headquartered in Sydney, Australia as of September 2026 and tracks 531 professional contacts across them, including 221 with verified work emails. Melbourne is the largest hub.

This list covers penetration testing firms headquartered in Sydney, 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 20, 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 20, 2026 86% judged on-target in blind review

86Companies

531Contacts tracked

221Verified emails

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The 25 largest penetration testing firms based in Sydney, Australia

Ranked by team size

Top 25 of 86 penetration testing firms based in Sydney, Australia, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to penetration testing firms: 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	Northbridge Systems	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	51-200	70 contacts →
	Indirect 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 20, 2026
2	Seccom Global	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	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 20, 2026
3	NSB Cyber	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	33 contacts →
	Indirect evidence “NSB Cyber is an Australian-founded, privately owned cyber security company based in Sydney.” Source: RevenueBase Database · checked Sep 20, 2026
4	Datcom Cloud	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	26 contacts →
	Indirect evidence “Minimise the risk of a cybersecurity incident.” Source: RevenueBase Database · checked Sep 20, 2026
5	Gridware	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	25 contacts →
	Indirect evidence “For most organisations in Australia, a data breach can be more than a PR disaster, it could be the final chapter.” Source: RevenueBase Database · checked Sep 20, 2026
6	Silentgrid Security	Strong evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	23 contacts →
	Strong evidence “SilentGrid is an offensive security consultancy with a focus on adversary simulation and penetration testing.” Source: RevenueBase Database · checked Sep 20, 2026
7	Threat Intelligence	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “Threat Intelligence is different.” Source: RevenueBase Database · checked Sep 20, 2026
8	Ciso Online	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “CISO Online™ specialises in Cyber Security, Governance, Risk & Compliance (GRC), and Secure AI adoption for government agencies, large enterprises, and SMBs across Australia and…” Source: RevenueBase Database · checked Sep 20, 2026
9	Intrix Cyber Security	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “Intrix Cyber Security protect businesses with our Information Security Services.” Source: RevenueBase Database · checked Sep 20, 2026
10	Skylight Cyber Security	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	15 contacts →
	Indirect evidence “Skylight is a boutique cyber security practice providing high-end services to the modern enterprise.” Source: RevenueBase Database · checked Sep 20, 2026
11	Parabellum	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	13 contacts →
	Indirect evidence “At Parabellum, we help organisations see clearly and act confidently in a complex digital world.” Source: RevenueBase Database · checked Sep 20, 2026
12	Zirilio	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	10 contacts →
	Indirect evidence “With ZIRILIO on your side, the digital world just became safer.” Source: RevenueBase Database · checked Sep 20, 2026
13	Volkis	Strong evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	10 contacts →
	Strong evidence “Volkis is a dedicated information security consultancy that provides penetration testing, security assessment, red team, GRC, and training services at its core.” Source: RevenueBase Database · checked Sep 20, 2026
14	Cyberhub Group	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence “CyberHub was established with the aim of making Cyber Security more available to companies of all sizes.” Source: RevenueBase Database · checked Sep 20, 2026
15	Asontu	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	8 contacts →
	Indirect evidence “We want to be the next generation of cyber security consultancy firms.” Source: RevenueBase Database · checked Sep 20, 2026
16	Iqbox PTY LTD	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	7 contacts →
	Indirect evidence “IQBOX helps you pinpoint your organization’s most pressing vulnerabilities, eliminate critical threats, and implement a security program that leaves you free to focus on…” Source: RevenueBase Database · checked Sep 20, 2026
17	Cyberpulse	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	6 contacts →
	Indirect evidence “CyberPulse partners with organisations to operationalise security across the full threat lifecycle, from governance and compliance through to detection, response, and continuous…” Source: RevenueBase Database · checked Sep 20, 2026
18	Project Black	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	6 contacts →
	Indirect evidence “Project Black is a CREST accredited Australian cybersecurity consultancy providing exceptional, transparent, and value-driven solutions.” Source: RevenueBase Database · checked Sep 20, 2026
19	DVULN	Strong evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	6 contacts →
	Strong evidence “Founded in 2016, Dvuln is a globally CREST-certified cybersecurity firm specialising in advanced penetration testing, adversary simulation, attacker-led threat hunting, and…” Source: RevenueBase Database · checked Sep 20, 2026
20	Cyberlinx	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	6 contacts →
	Indirect evidence “Cyberlinx is a premier cyber security solutions and services provider, we offer a comprehensive range of cyber security solutions, including, infrastructure and network security…” Source: RevenueBase Database · checked Sep 20, 2026
21	Vertex Cyber Security	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	11-50	6 contacts →
	Indirect evidence “Vertex Cyber Security provides an extensive Cyber Security capability of Technology and Security Services for organisations across Sydney.” Source: RevenueBase Database · checked Sep 20, 2026
22	Fort1 PTY LTD	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	5 contacts →
	Indirect evidence “Fort1: Comprehensive Cybersecurity Services based in Australia.” Source: RevenueBase Database · checked Sep 20, 2026
23	D2unet PTY LTD	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	5 contacts →
	Indirect evidence “At D2UNet, we take a multi-faceted approach to cybersecurity.” Source: RevenueBase Database · checked Sep 20, 2026
24	Nsaa Security	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	5 contacts →
	Indirect evidence “Who are NSAA Security NSAA Security team have years of experience working within highly demanding information security environments.” Source: RevenueBase Database · checked Sep 20, 2026
25	Centropy Services & Solutions	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	1-10	4 contacts →
	Indirect evidence “The term Centropy is a scientific reference to the reversal of chaos or entropy.” Source: RevenueBase Database · checked Sep 20, 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: penetration testing firms. 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 penetration testing firms.
Partial evidence: Its own public description names part of penetration testing firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name penetration testing firms. 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 86 penetration testing firms based in Sydney, Australia

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Penetration testing firms based in Sydney, Australia at a glance

As of Sep 20, 2026

41.6%Verified-email coverage

6.2Average contacts per company

1-10Median size (employees)

101.2%Largest-city concentration · Melbourne

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole Australia list rather than for Sydney, so it is reported there. Company counts and contact totals on this page are exact for Sydney, over 86 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 penetration testing firms, 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 Sydney, Australia whose own description of what they do matches “penetration testing firms”. 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 penetration testing firms), 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 penetration testing firms, and records with no verified work email. Companies headquartered outside Sydney 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, 221 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 20, 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.

Penetration testing firms by metro in Australia

Penetration testing firms in Melbourne87
Penetration testing firms in Sydney86
Penetration testing firms in Brisbane37

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 penetration testing firms, 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 penetration testing firms are there based in Sydney, Australia?

RevenueBase identified 86 penetration testing firms headquartered in Sydney, 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?

Northbridge Systems, headquartered in Sydney, tops this list with the largest team on record.

Which city has the most penetration testing firms?

Melbourne leads with 87 headquartered companies, followed by Sydney (86) and Brisbane (37).

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 221 verified decision-maker contacts tracked across these 86 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 20, 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.