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BIND 9Knot DNS
Free

Free and open source under the Mozilla Public License 2.0.

 Free

Free to download and use under the GPL 3 or later license.

macOS, Linux, Self-hosted, Command line macOS, Linux, Command line
  • dig is a standard tool for DNS troubleshooting
  • Full-featured DNS server with DNSSEC
  • Automatic DNSSEC signing
  • IXFR, dynamic updates and response rate limiting
  • dig comes as part of the larger BIND package
  • Server configuration has a steep learning curve
  • Authoritative only, with no recursive resolver
  • No Windows support
Downloadable app, Self-hosted Downloadable app
Open source Open source
License: MPL-2.0 License: GPL-3.0-or-later
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked October 2, 2026

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