ISC operates the “F” root domain server, one of the 13 Internet root name servers known as A-root through M-root. We have operated F-Root for IANA since 1994. The Root Server Technical Operations Association maintains a map that shows the location of all of the world’s root name servers. Over 125 of them are F Roots, operated by ISC.
If you are perplexed that over 125 (the number of F-root servers) is greater than 13 (the number of root name servers), you can read about the “anycast” scheme used to make the servers collectively behave as one server. F-root answers queries over IPv4 on 18.104.22.168, and over IPv6 on 2001:500:2f::f using a hierarchical anycast technique and BIND 9 software. Network operators can improve their access to the F Root Nameserver, and hence the reliability of the DNS in general, by peering with ISC at the exchange points where we maintain a presence.
We have almost 3,000 F-root peers. For information about peering with ISC, see our Peering Information Page.
Our Commitment to F-Root
On January 4th, 2008, ISC became the first root server operator to sign a Mutual Responsibilities Agreement with ICANN, which identifies mutual responsibilities and is another step to enhance Internet stability.
Below is a map showing the locations of F-root nodes worldwide. For more information and resources about F-Root, such as locations and identifying which F-root is providing service to you, visit our F-Root Resources Page.
- F-Root Anycast Placement Research Using RIPE Atlas (UKNOF 2015)
- F-Root in Africa (AFRINIC 2014)
- RSSAC Restructure Update and Statement on RSSAC 001 and 002
- Service Expectations of Root Servers
- RSSAC 002 Recommendation on Measurements of the Root Server System
- RSSAC 003 Report on Root Zone TTLS
- Frequently-asked questions about the DNS Root
- What is the DNS Root?
Research on the DNS root
- How much traffic do the Root Servers see?
- Root response-time measurements – CAIDA
- Root response-time measurements – RIPE Atlas