MassDNS – A high-performance DNS stub resolver in C
A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration) - blechschmidt/massdns
MassDNS – A high-performance DNS stub resolver in C launched on June 25, 2016 with 35 votes, #1,522 of 4,334 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 10 years on.
In plain words
MassDNS is a high-performance DNS stub resolver written in C designed for performing bulk DNS lookups and reconnaissance tasks like subdomain enumeration. It enables security researchers and network administrators to efficiently query large numbers of domain names in a single operation. The tool processes DNS requests at scale, making it useful for reconnaissance work that would be impractical with standard DNS tools.
written from the facts on this page · September 2026
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