recon-subdomain

Enumerate subdomains and gather DNS records using subfinder, amass, and dnsx.

277|29|Updated Feb 6, 2026
One-click install
npx skills add https://github.com/crazyMarky/pentest-skills --skill recon-subdomain
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: recon-subdomain
Source: https://github.com/crazyMarky/pentest-skills/tree/main/recon-subdomain
Command: npx skills add https://github.com/crazyMarky/pentest-skills --skill recon-subdomain

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill helps you uncover all subdomains associated with a target domain, revealing a broader attack surface that might otherwise go unnoticed.

Core Features & Use Cases

  • Subdomain Enumeration: Discover subdomains using various passive and active techniques.
  • DNS Reconnaissance: Gather DNS records and verify subdomain resolution.
  • Use Case: When assessing the security of a web application, use this Skill to find all associated subdomains like dev.example.com, api.example.com, or staging.example.com to identify potential entry points.

Quick Start

Find all subdomains for example.com and save them to a file named resolved_subs.txt.

Frequently Asked Questions about recon-subdomain

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I discover hidden subdomains to map a target's attack surface?

To discover hidden subdomains and map an attack surface, you can perform subdomain enumeration using passive and active techniques to uncover all associated domains for a target.

What's the best way to gather DNS records and verify subdomain resolution?

The best way to gather DNS records and verify subdomain resolution is by running DNS reconnaissance alongside subdomain enumeration to validate that discovered targets actively resolve.

Can I use subfinder and amass together for subdomain enumeration?

Yes, you can leverage subfinder and amass together for subdomain enumeration, combining their passive and active discovery techniques to achieve more thorough target coverage.

How do I find all associated subdomains like dev or api for a web application?

To find all associated subdomains like dev or api for a web application, perform comprehensive enumeration against the target domain to identify potential entry points across the expanded attack surface.

Does subdomain enumeration require active scanning to identify potential vulnerabilities?

Subdomain enumeration identifies potential vulnerabilities by expanding the attack surface, utilizing both passive and active techniques to reveal hidden subdomains that might otherwise go unnoticed.