A42 is an automated cybersecurity platform that continuously monitors your company's external digital perimeter. It discovers all subdomains (including shadow assets), detects exploitable vulnerabilities, monitors the dark web for leaked credentials, and delivers bi-weekly security reports without manual intervention.

How often does A42 scan my assets?

A42 performs automated bi-weekly scans of all your assets with scheduled recursive scanning — no manual input required from your security team.

What is external perimeter monitoring?

External perimeter monitoring is the practice of continuously scanning all internet-facing assets of your company — domains, subdomains, IPs, and exposed services — to detect vulnerabilities before attackers exploit them. A42 automates this, discovering even shadow assets your team may not know about.

Does A42 detect leaked credentials on the dark web?

Yes. A42's Dark Web Monitoring scans dark web sources for leaked credentials and sensitive data linked to your domain shared in illicit databases, helping you respond before attackers exploit the information.

A42 is used by IT security teams, DevOps engineers, CTOs, and business owners. Clients include Jooble (international job platform, 67 countries), DOT (Ukrainian government agency supporting the Armed Forces), fintech companies, and e-commerce platforms.

How is A42 different from traditional scanners like Tenable?

Unlike Tenable, which requires manual configuration of scan targets, A42 automatically discovers all subdomains and exposed services — including ones never added to a scan scope. A42 detects exploitable vulnerabilities, not just alerts, reducing noise and focusing on real risks.

A42 is a Ukrainian company (A42, LLC, reg. №45790296), headquartered at 17 Hlybochytska str., Kyiv, Ukraine, 04052. The team has deep expertise in offensive security and cyber defense, with government and NATO partnerships.

Scan deep, sleep well

A42 – a platform that automatically monitors your company's external perimeter – domains, subdomains, exposed services, detects data leaks and vulnerabilities before they can be exploited by attackers

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A42 – not an option, but a must-have

Full control of your security

Trust, but verify. Even the most skilled staff and highly paid specialists are not immune to human error. Our service acts as a control mechanism - while a mistake for a specialist may result in dismissal, for you it could mean reputational damage, financial loss, or even legal liability.

Resource efficiency (time, funds)

Simplify your DevOps workflow. Our service can save dozens of hours of manual work, allowing your team to focus on what truly matters.

Automated and recursive scanning

Consistency is key. We conduct scheduled scans of all your subdomains to detect vulnerabilities and errors, delivering instant reports – all without the need for manual intervention from your team.

Critical Infrastructure

Essential Protection

Private Companies

Asset Defense

Healthcare Organizations

Data Security

Medium Businesses

Affordable Security

Digital Perimeter Control

Discovery of all subdomains, including shadow assets

People forget. A42 doesn’t.

We scan all your assets — automatically, bi-weekly.

Real risks, not noise

We detect exploitable vulnerabilities — not just alerts

Our Product

AI-Powered

Deep Reconnaissance

We leverage multiple techniques and tools to accurately map all related subdomains. Our integrated approach combines broad data collection, advanced detection tools and AI algorithms.

Automated

Automated Scanning

Our product performs scheduled, recursive scans to deliver thorough exposure reports, eliminating the need for manual input and ensuring continuous monitoring.

Real-time

Dark Web Monitoring

Our system scans dark web sources for leaked credentials and sensitive data linked to your domain that may have been shared to illicit databases.

Visual

Exposure Mapping

A visual tool that identifies and categorizes detected vulnerabilities, facilitating effective planning of your patch management and remediation processes.

Large-scale

IP Vulnerability Scanner

A tool that conducts large-scale scans of your business's IP address to assess its detectability and identify potential vulnerabilities.

Ready to Secure Your Business?

Get a comprehensive security assessment and protect your digital assets with our advanced cybersecurity solutions.

How It Works > 3 Simple Steps

Add Your Domain

No complicated setup, just connect and go

Confirm Ownership

Securely verify your digital assets

Receive a Security Report

Get real-time alerts and recommendations

free consultation or demo

Contact Us

Receive a list of services in exchange for your email and the domain you want to test for your first free security assessment. If no vulnerabilities are found, you will receive a "Verified by A42" certificate. If critical vulnerabilities are identified, we will provide you with a detailed report.