The easiest way in is the one you didn’t know about. Old subdomains. Forgotten tools. Staging servers left exposed. Shadow IT. Most organisations have them – and attackers know it. Asset Discovery is about knowing what’s live, what’s exposed, and what needs fixing before someone else finds it first.

What We’ve Built

AppCheck Asset Discovery gives you full visibility of your internet-facing estate. It runs automated discovery scans to surface every live web asset and API endpoint – no matter which team spun it up or when.

Each week, the platform maps your digital footprint and alerts you to any changes. When a new asset appears, you can immediately trigger AppCheck’s security testing to identify critical, high, medium, or low-risk vulnerabilities.

It’s the first step in securing your real-world attack surface.

How It Works

AppCheck uses a broad set of OSINT (Open-Source Intelligence) techniques to identify assets safely and non-intrusively. These include:

• Distributed banner grabbing across IP ranges
• Passive DNS dumps and reverse DNS lookups
• TLS certificate scanning (HTTPS, SMTP, etc.)
• Domain and subdomain extraction from HTTP metadata
• External DNS zone file analysis and WHOIS metadata
• Port scanning across standard services (HTTP, SMTP, SSH, etc.)

The process is designed to be accurate, low-noise, and low-risk. You see what’s out there – not what attackers could guess, but what’s actually live.

Why It Matters

You can’t secure what you can’t see. And most security tools rely on you telling them where to look.

Asset Discovery shifts that. It gives you a continuous, outside-in view of your public-facing infrastructure, helping you:

• Reduce blind spots across dev, staging, and production
• Spot shadow IT and unauthorised assets
• Respond faster to changes in your external footprint
• Automate security testing workflows tied to real asset changes

What Comes Next

This is AppCheck’s first step into full Attack Surface Management (ASM). The goal: see everything, test everything, secure everything – all from one platform.

More capabilities are coming, but Asset Discovery is available today.

Start Your First Discovery Scan

If you’re already using AppCheck, Asset Discovery is ready to activate. If not, speak to us about how we can help map your real-world risk.