> ## Documentation Index
> Fetch the complete documentation index at: https://docs.snapsec.co/llms.txt
> Use this file to discover all available pages before exploring further.

# External Asset Discovery

> Passive and active external reconnaissance mapping your entire public internet footprint.

Snapsec Attack Surface Management (ASM) scans the public internet from an adversary's perspective, discovering assets without needing credentials or installed software.

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## Multi-Source Discovery Engine

Snapsec combines over a dozen passive and active discovery mechanisms:

* **Certificate Transparency Logs (CTL)**: Real-time monitoring of TLS certificate issuances.
* **Authoritative DNS Brute-Forcing & Permutations**: Identifying non-public subdomains.
* **BGP Routing & ASN Announcements**: Mapping registered IP blocks and CIDR prefixes.
* **Passive Threat Intelligence Feeds**: Ingestion from Shodan, Censys, SecurityTrails, and HackerTarget.
* **Web Crawlers**: Discovering linked assets, APIs, and CDN endpoints from public web pages.


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