djbdns

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Every plan, in full

On the record

Cache protection

The maker says dnscache uses unpredictable query IDs and UDP ports and is immune to cache poisoning.cr.yp.to · read 9 Oct 2026

Client tools

The package includes a DNS client C library and command-line utilities for sending requests to DNS caches.cr.yp.to · read 9 Oct 2026

Debugging

The package includes DNS debugging tools, including dnstrace for diagnosing misconfigured remote servers.cr.yp.to · read 9 Oct 2026

Distribution terms

The maker states that the djbdns package was placed in the public domain on 2007-12-28.cr.yp.to · read 9 Oct 2026

DNS cache

The dnscache program finds addresses of Internet hosts and can run on a workstation or for an ISP's customers.cr.yp.to · read 9 Oct 2026

DNS server

The tinydns program publishes locally configured IP address information in response to iterative DNS queries.cr.yp.to · read 9 Oct 2026

Latest package

The installation page identifies djbdns-1.05.tar.gz as the latest published package.cr.yp.to · read 9 Oct 2026

OS support

The installation page says djbdns works only under UNIX and specifically says SCO UnixWare is unsupported.cr.yp.to · read 9 Oct 2026

Prerequisites

The maker's installation instructions require daemontools 0.70 or above and ucspi-tcp to be installed first.cr.yp.to · read 9 Oct 2026

Purpose

djbdns is a collection of tools for DNS caching, serving, client lookups, and debugging.cr.yp.to · read 9 Oct 2026

Security design

The maker's security page says dnscache, tinydns, and walldns run under dedicated non-root accounts in chroot jails.cr.yp.to · read 9 Oct 2026

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.cr.yp.to · read 9 Oct 2026

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.cr.yp.to · read 9 Oct 2026

Support

The maker points users to the dns mailing list and says third-party commercial support is available.cr.yp.to · read 9 Oct 2026

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