djbdns

cr.yp.to · checked 9 Oct 2026

#16 · DNS Server Software

Visit cr.yp.to ↗ Alternatives djbdns vs CoreDNS

How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on DNS Server Software5.7#16 of 23

djbdns is a collection of tools for DNS caching, serving, client lookups, and debugging.

Pricing

djbdns-1.05Free to download, compile, and run · latest published package named djbdns-1.05.tar.gzFree

As cr.yp.to lists them, checked 9 Oct 2026.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: cr.yp.to
Price: Free tier
Free trial: Not stated
Cache protection: The maker says dnscache uses unpredictable query IDs and UDP ports and is immune to cache poisoning.
Client tools: The package includes a DNS client C library and command-line utilities for sending requests to DNS caches.
Debugging: The package includes DNS debugging tools, including dnstrace for diagnosing misconfigured remote servers.
Distribution terms: The maker states that the djbdns package was placed in the public domain on 2007-12-28.
DNS cache: The dnscache program finds addresses of Internet hosts and can run on a workstation or for an ISP's customers.
DNS server: The tinydns program publishes locally configured IP address information in response to iterative DNS queries.
Latest package: The installation page identifies djbdns-1.05.tar.gz as the latest published package.
OS support: The installation page says djbdns works only under UNIX and specifically says SCO UnixWare is unsupported.
Prerequisites: The maker's installation instructions require daemontools 0.70 or above and ucspi-tcp to be installed first.
Security design: The maker's security page says dnscache, tinydns, and walldns run under dedicated non-root accounts in chroot jails.
Security guarantee: The maker offers $1000 to the first person to publicly report a verifiable security hole in the latest version, with stated exclusions including denial-of-service attacks.
Server limitation: tinydns listens for UDP queries on port 53 and does not listen for TCP queries; the maker documents axfrdns for TCP service and zone transfers.

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DNS Server Software#16 of 23

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