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BIND 9dnslookup
Free

Free and open source under the Mozilla Public License 2.0.

 Free

Free to download and use.

macOS, Linux, Self-hosted, Command line macOS, Linux, Command line
  • dig is a standard tool for DNS troubleshooting
  • Full-featured DNS server with DNSSEC
  • Supports DoH, DoT, DoQ and DNSCrypt in one tool
  • Simple to point at any specific DNS server
  • dig comes as part of the larger BIND package
  • Server configuration has a steep learning curve
  • Command line only, no graphical interface
  • Focused on single lookups rather than full DNS diagnostics
Downloadable app, Self-hosted Downloadable app
Open source Closed source
License: MPL-2.0 License not stated
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked October 1, 2026

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