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Internet Systems Consortium

Internet Systems Consortium (ISC) develops the BIND 9 DNS server, the Kea and ISC DHCP servers and the Stork management tool. Current releases are open source under the Mozilla Public License 2.0, and ISC funds the work by selling annual professional support subscriptions that include some commercially licensed editions and hooks.

Licensing at a Glance

  • Open source
  • Subscription

  1. All current versions of BIND 9 (except the BIND -S Edition), all current versions of Kea DHCP, ISC DHCP 4.4.0 and later, and all versions of Stork are available under the Mozilla Public License 2.0.[1]

  2. The BIND -S edition is under a commercial licence, and some Kea hooks are MPL 2.0 while others are commercially licensed; the Kea Administrative Reference Manual states which hooks are open source.[2]

  3. BIND 9 before 9.11.0b, ISC DHCP before 4.4.0 and Kea before 1.0.0 were released under the ISC License.[3]

  4. ISC sells annual software support at Gold, Silver, Bronze and Basic levels; the BIND 9 -S edition is included at Gold and Silver, and Kea subscriber software at all four levels.[4]

  5. Free community help is available through the bind-users, dhcp-users, kea-users and stork-users mailing lists.[5]

Products

References

  1. ISC Open Source Software Licenses - ISC · isc.org · retrieved 2026-09-27
  2. ISC Open Source Software Licenses - ISC · isc.org · retrieved 2026-09-27
  3. ISC Open Source Software Licenses - ISC · isc.org · retrieved 2026-09-27
  4. Professional Support for Open Source - ISC · isc.org · retrieved 2026-09-27
  5. Professional Support for Open Source - ISC · isc.org · retrieved 2026-09-27
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