Individual skill

recon-dns-analysis

Deep DNS analysis for attack surface — record mining, zone transfers, DNSSEC/NSEC walking, and dangling records. Load during recon, on "DNS", a domain in scope, or hunting takeovers/origin IPs. Signals: a root domain, CNAMEs, MX/TXT/SPF, NS servers, subdomains to resolve.

skills/recon/recon-dns-analysis/SKILL.md

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Last checked: Nov 11, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

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# DNS analysis

## When it applies
Early recon and anytime you want surface/intel from DNS: subdomains, mail/infra hints, cloud
providers, dangling records (takeover leads), and origin IPs hiding behind a CDN.

## Why it works
DNS is a public map of an org's infrastructure. Records leak providers (CNAME → SaaS), mail and
SPF/DMARC hosts, and misconfigurations (open zone transfer dumps everything; NSEC lets you walk a
DNSSEC zone). Stale records point at deprovisioned services (→ takeover).

## Method
1. **Enumerate records**: `dig ANY domain`, plus explicit `A AAAA CNAME MX TXT NS SOA` — TXT/SPF
   reveal third parties; MX reveals mail infra.