blechschmidt/massdns

Health v2 · maintenance only

Adoption not part of the score

3635 stars · 504 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

MassDNS is a high-performance DNS stub resolver written in C, capable of resolving millions to billions of domain names at over 350,000 lookups per second. It is primarily used for bulk DNS resolution and subdomain enumeration during reconnaissance.

Use cases

• resolve millions of domain names in bulk
• enumerate subdomains for a target domain
• perform DNS reconnaissance during security assessments
• snoop DNS caches with non-recursive queries
• test DNS resolvers at scale
• validate large domain lists quickly

When to choose

• you need to resolve a massive volume of DNS names quickly
• you are doing subdomain enumeration or attack-surface discovery
• you want a lightweight C tool with fine-grained resolver control

When to avoid

• you only need occasional single-domain lookups (use dig or a library instead)
• you cannot legally or ethically use third-party open resolvers at high query rates
• you need a managed DNS API rather than a raw resolver

Facets

cli-tool · maturity stable

networking security developer-tools security networking osint windows cli dns dns-resolver subdomain-enumeration reconnaissance bulk-lookup dns-bruteforce command-line linux macos

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markdown · JSON · MCP: product_card(name="blechschmidt/massdns")