We've just posted a blog on BIND 9.20 resolver performance compared to 9.18. tl;dr: under mid- to heavy traffic loads, 9.20 uses less memory than 9.18.
Read more about our performance benchmarking at www.isc.org/blogs/2026-0...
Thanks for using ISC's software!
ISC is pleased to announce the results of code audits for our Kea DHCP and Stork graphical management software projects! Thank you to @ostifofficial.bsky.social and the ICANN Grant Program for their support and assistance.
Read more about the audits at www.isc.org/blogs/2026-t...
Packages and container images provided by ISC will be updated later today.
New maintenance releases of BIND 9 are available and can be downloaded at isc.org/download/#BIND. The new stable branches are 9.18.46 and 9.20.20, and the new development branch is 9.21.19.
Please see the release notes for important changes and details.
Thank you for using ISC's software!
Packages and container images provided by ISC will be updated later today.
The new Stork includes lots of changes, including direct API support for Kea; improved DNS monitoring support for both BIND 9 and PowerDNS; sortable tables, many security improvements; an updated user interface; build, test, and documentation upgrades; and many bug fixes.
ISC is pleased to announce the releases of Kea DHCP 3.1.6 (development branch) and Stork 2.4.0, a new stable branch.
Software and release notes available at www.isc.org/download/
Thank you for using ISC’s software!
Our February 2026 maintenance releases of BIND 9 are available for versions 9.18.45, 9.20.19, and 9.21.18. Packages and container images provided by ISC will be updated later today.
Download source code and release notes at www.isc.org/download/
Thank you for using ISC's software!
ISC mourns the loss of one of our board members, Dr. David "Dave" Farber: www.isc.org/blogs/david-...
ISC, CZ.NIC, NLnet Labs, and NetDEF have jointly submitted a response to the European Open Digital Ecosystem Strategy, and we invite everyone to read it.
www.isc.org/blogs/open-d...
BIND 9 January 2026 maintenance releases are available at isc.org/download. Packages and container images provided by ISC will be updated later today.
In addition to bug fixes and feature improvements, these releases also contain fixes for a security vulnerability:
kb.isc.org/docs/cve-202...
2025 was a highly productive year for our BIND 9 DNS team! They focused on modernizing the code, improving performance, and adding new features. Find out more at www.isc.org/blogs/2025-b...
Our DHCP development team was very busy in 2025! Find out more about the progress on our Kea and Stork software at www.isc.org/blogs/2025-d...
The European Commission's offer to fund a bug bounty for BIND 9 impressed us. The YesWeHack team are doing the initial triage and using their expertise to minimize the "slop" reports, which should be a game-changer for our small development team.
It's live!
yeswehack.com/programs/bin...
Want to know a little more about one of ISC's staff members? Come meet Razvan Becheriu, a senior DHCP software engineer! www.isc.org/blogs/isc-pr...
Check out some of our previous staff profiles on our blog while you're there. 🙂
ISC wishes all our customers and open source users a very happy and healthy holiday season. Please check out our 2025 holiday "card"!
www.isc.org/blogs/2025-h...
Each release directory on our download site includes a complete source tarball, cryptographic signature, and release notes.
- 9.18.43 - downloads.isc.org/isc/bind9/9....
- 9.20.17 - downloads.isc.org/isc/bind9/9....
- 9.21.16 - downloads.isc.org/isc/bind9/9....
The BIND 9.18.43 / 9.20.17 (stable) and BIND 9.21.16 (development) releases are now available at www.isc.org/download/ !
Packages and container images provided by ISC will be updated later today.
Thank you for using ISC's software!
Are you looking for a new challenge? Would you like to be part of a great team - and work remotely? ISC is looking for a QA engineer for our Stork graphical management tool for DNS and DHCP!
All qualified candidates are encouraged to apply at isc.recruitee.com/o/stork-qa
Stork 2.3.2 is available: www.isc.org/download#Stork. Packages and container images provided by ISC will be updated later today.
This is a development version; please note that development versions are not recommended for use in production.
Thank you for using ISC's software and happy holidays!
ISC is pleased to announce the release of Kea 3.1.4, a development release.
The releases are available from the ISC download page at www.isc.org/download/#Kea or from our Cloudsmith repositories. Development versions are not suitable for production use.
Thank you for using ISC's software!
Please read the release notes for details on the changes in these versions.
As a reminder, BIND’s supported platforms are listed in the ARM (bind9.readthedocs.io/en/stable/ch...) and in this knowledgebase article (kb.isc.org/docs/support...).
ISC's November 2025 maintenance releases of BIND 9 are available! 9.18.42 and 9.20.16 are the current stable branches, and 9.21.15 is the development branch.
www.isc.org/download
Packages and container images provided by ISC will be updated later today.
Please note that both versions address a vulnerability in kea-dhcp4; see kb.isc.org/docs/cve-202....
Kea 3.0.2 (stable) and 3.1.3 (maintenance, the latest versions of ISC's DHCP server software, are released.
Downloads available at www.isc.org/download/#Kea and from our Cloudsmith repos. Development versions are not suitable for production use.
Thank you for using ISC’s software!
In addition to bug fixes and feature improvements, these releases also contain fixes for security vulnerabilities (CVE-2025-8677, CVE-2025-40778, CVE-2025-40780):
kb.isc.org/docs/cve-202...
kb.isc.org/docs/cve-202...
kb.isc.org/docs/cve-202...
Our October 2025 maintenance releases of BIND 9 are available!
www.isc.org/download
Packages and container images provided by ISC will be updated later today.
Check the release notes for important changes.
Thanks for using ISC's software!
Development versions are not intended for production use, but we encourage you to try it out in a test environment.
Stork 2.3.1 includes upgrades to the UI, improvements to BIND 9 management, security and build improvements, plus several bug fixes.
ISC has released Stork 2.3.1, the latest issue of our development branch. Stork is our open source graphical management tool for DNS and DHCP.
Download it from isc.org/download or our Cloudsmith repo at cloudsmith.io/~isc/repos/s...
Thank you!
If you're currently a user of OpenDNSSEC, you might find this new KB article about migrating from OpenDNSSEC to BIND 9 useful: kb.isc.org/docs/migrati...
And if you'll be at the #oarc45 meeting next week in Stockholm, several ISC staff members will also be there and would love to chat with you!
