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Mission Critical Software

We’re the authors of the DNS open source software BIND, we’ve written over 60 RFCs, and we’re proud to be contributors to the Internet Engineering Task Force.





F-Root Operator

We’ve operated F-Root, one of the world’s thirteen root name servers, since 1994. We also provide secondary DNS hosting for 54 ccTLDs around the world.

Network Peering




Public Benefit

We’ve contributed more than $68,000,000 in software and engineering hours to the internet community, looking to build a faster, more secure and reliable Internet.



  • Important Security Advisory Posted

    We have today posted updated versions of 9.9.6 and 9.10.1 to address a significant security vulnerability in DNS resolution. The flaw was discovered by Florian Maury of ANSSI, and applies to any recursive resolver that does not support a limit on the number of recursions. , A flaw in delegation handling could be exploited to put named into

    Read more


F-Root is distributed using “anycast” technology all around the world, with 54 operational locations, carrying 25% of the root name server traffic, and operating an average 16,000 queries per second. ISC is pleased to announce that a new F-Root DNS Root node has returned to MyIX, in Kuala Lumpur, Malaysia, sponsored by Persatuan Pendendali Internet Malaysia. Previously, ISC had a node in MyIX from 2008 to mid-2013, but with this new sponsorship and new equipment, F-Root has returned to MyIX in May 2014 to serve the Malaysian and regional Internet community. ISC eagerly accepts peering requests at the new MyIX node as well as exchange points all over the globe. Please see for more information.

Static map of F-root

View F Root in a larger map


Is your software updated against a security vulnerability? It is important to keep your software up-to-date against potential cyber attacks and vulnerabilities. View the latest security advisories for BIND and DHCP at ISC’s KnowledgeBase or Security Advisory page.

You can also subscribe to our Security Vulnerability RSS Feed:

Community Support


BIND  and DHCP are open source software. Community support is available on our two public mailing lists: bind-user and dhcp-user.  We also provide expert professional support for our enterprise users via You can reach our support team by filling out the form at BIND security is critical to the Internet Infrastructure. If you think you may be seeing a potential security vulnerability in BIND (for example, a crash with REQUIRE, INSIST, or ASSERT failure), please report it immediately to and do not post it on the public mailing list. To report a bug, please submit a Bug Report Form, or submit via email to and If you wish to submit a feature request, email us at:



UKNOF30 London, United States 8:30 AM - 6:00 PM, 22 January, 2015

FOSDEM '15 Bruxelles, Belgium All Day, 31 January, 2015 - 01 February, 2015

NANOG 63 San Antonio, United States All Day, 02 February, 2015 - 04 February, 2015

Introduction to DNS & BIND [Hands-On] Amsterdam, Netherlands 8:30 AM - 5:00 PM, 02 February, 2015 - 03 February, 2015

ICANN52 Singapore, Singapore All Day, 08 February, 2015 - 12 February, 2015



Sponsor Highlights

Facebook, Inc., has made a contribution for 2014 to help support continued development of the  Kea DHCP server. Kea is not nearly as feature-rich as the more mature ISC DHCP server, but it is useful today for datacenter networking.

JANET, the UK’s Research and Education Network, made a much-appreciated 2014 charitable donation to ISC. This contribution, and others like it, go directly to supporting the maintenance of our free open-source software, improving the quality for all.