massdns

Resolve domains from file

$ massdns -r [resolvers.txt] -t A [domains.txt]

$ massdns -r [resolvers.txt] -t A -o S [domains.txt] > [results.txt]

$ massdns -r [resolvers.txt] -s [10000] [domains.txt]

$ massdns -r [resolvers.txt] -t [MX] [domains.txt]

$ massdns -r [resolvers.txt] -t A -o S [domains.txt]

massdns [options] domainlist

massdns is a high-performance DNS stub resolver for bulk lookups. It can resolve millions of domains per hour using multiple resolvers in parallel.
The tool is designed for subdomain enumeration and DNS reconnaissance during authorized security assessments. It handles resolver rotation and error recovery automatically.

-r file

Resolver list file.

Query type (A, AAAA, MX, NS, etc.).

Output format (S=simple, F=full, J=JSON).

Queries per second.

Write output to file.

Concurrent queries.

Allow binding to privileged ports.

Quiet mode.

Requires good resolver list. High rates may trigger rate limiting. Resolver reliability varies. Only for authorized testing.

massdns was created by B. Blechschmidt for high-speed DNS resolution needs in security research. It fills the gap between single-query tools and the need to resolve millions of domains efficiently.

dig(1), host(1), subfinder(1), dnsx(1)