massdns
high-performance DNS stub resolver for bulk lookups
TLDR
Resolve domains from file
$ massdns -r [resolvers.txt] -t A [domains.txt]
Output to file$ massdns -r [resolvers.txt] -t A -o S [domains.txt] > [results.txt]
Concurrent queries$ massdns -r [resolvers.txt] -s [10000] [domains.txt]
Query specific record type$ massdns -r [resolvers.txt] -t [MX] [domains.txt]
Simple output format$ massdns -r [resolvers.txt] -t A -o S [domains.txt]
SYNOPSIS
massdns [options] domainlist
DESCRIPTION
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.
PARAMETERS
-r file
Resolver list file.-t type
Query type (A, AAAA, MX, NS, etc.).-o format
Output format (S=simple, F=full, J=JSON).-s rate
Queries per second.-w file
Write output to file.-c num
Concurrent queries.--root
Allow binding to privileged ports.-q
Quiet mode.
INSTALL
sudo dnf install massdns
brew install massdns
nix profile install nixpkgs#massdns
CAVEATS
Requires good resolver list. High rates may trigger rate limiting. Resolver reliability varies. Only for authorized testing.
HISTORY
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.
