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NSDBIND 9
Free

Free and open source under the BSD license; paid support is available.

 Free

Free and open source under the Mozilla Public License 2.0.

Linux, Self-hosted macOS, Linux, Self-hosted, Command line
  • Very high query throughput
  • Used by DNS root servers and TLD registries
  • dig is a standard tool for DNS troubleshooting
  • Full-featured DNS server with DNSSEC
  • Authoritative only, with no recursive resolver
  • Aimed at operators comfortable with DNS server configuration
  • dig comes as part of the larger BIND package
  • Server configuration has a steep learning curve
Downloadable app, Self-hosted Downloadable app, Self-hosted
Open source Open source
License: BSD License: MPL-2.0
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.