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The DNS root is not 13 server clusters. It is 13 named root-server identities, labelled A through M, and together they are represented by more than 1,500 individual servers run by 12 independent operators, according to ICANN. K-root, the identity labelled K, is operated by RIPE NCC, the Amsterdam-based regional internet registry. It is delivered from distributed nodes using anycast, so one service address is announced from many locations. It is not a single machine, and it is not a single site. The headline’s figures of about 1.6 million queries per second and more than 140 sites cannot be confirmed from the current official sources, so this article does not repeat them as facts.
What the 13 letters actually count
The letters A through M are identities. Each one is a stable name and a pair of published addresses that resolvers use to reach the root. They are not a count of physical machines, data centres or clusters. IANA maintains the listing that ties each letter to its IPv4 and IPv6 addresses and to the organisation responsible for it.
Because there are 13 identities but 12 operators, at least one operator must run more than one letter. The 13 identities are the stable part of the system; the servers behind them can change without the labels changing.
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Identity versus instance
Two terms cause most of the confusion around this topic:
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- Identity: one of the 13 root-server labels (A to M), each with its published addresses. Identities are fixed and are what appear in the root hints that resolvers start from.
- Instance: a physical server, or a server inside a node, that answers queries on behalf of an identity. ICANN’s figure of more than 1,500 individual servers counts instances, as accessed in 2026.
So “13 servers” is wrong on two counts: there are 13 identities, and those identities are backed by well over a thousand machines.
What the root does for a resolver
When a resolver needs to look up a name such as example.org, it does not start with the name’s own authoritative server. It starts with the root. The root zone holds referral information that points to the servers responsible for each top-level domain, such as .org or .uk. From there, the resolver follows the referrals down to the server that actually holds the answer.
ICANN describes the root identities as providing identical root-zone information to resolvers. Any identity should therefore give the same referral answer, which is why a resolver does not need to know which letter, or which site behind a letter, it happens to reach.
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K-root: who runs it and how it is deployed
RIPE NCC operates K-root, which is served under the name k.root-servers.net. RIPE NCC describes the service as distributed nodes that use IPv4 and IPv6 anycast.
Anycast and the single-address idea
Anycast means the same IP prefix is announced from several places on the internet. Routing then carries a query to one of those locations, usually a nearby one, and the reply comes from that node. Every node presents the same address, so to a user the service looks like one address worldwide, even though the traffic is handled by many separate machines.
The phrase “one IP address” is therefore shorthand that misleads in two ways. K-root has an IPv4 address and an IPv6 address listed by IANA, and the anycast deployment behind those addresses is distributed.
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What runs on each node
RIPE NCC’s public service description says each K-root node announces the service prefixes from autonomous system AS25152. Each node consists of one or more servers running BIND, Knot or NSD. These are open-source DNS server software packages, so the K-root service is not tied to one vendor’s product.
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RIPE NCC states that it serves the IANA root zone and monitors nodes for current zone data. In its statement on the RSSAC001v2 service expectations for root server operators, published 8 May 2026, RIPE NCC said: “The RIPE NCC serves the IANA root zone and responds with complete and unmodified data on k.root-servers.net infrastructure.”
The same statement covers failure. A node that is cut off from the controlling infrastructure can keep answering from the zone it holds, but only until that zone expires. At that point the node withdraws its service automatically rather than serving stale data. RIPE NCC also acknowledges that for a short period, sites or servers may hold slightly different data while an update propagates.
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Which numbers hold up
Several figures circulate with the headline. Only some of them are supported by current official material, and the table below separates them.
| Claim | Status in current official sources | Wording to use |
|---|---|---|
| 13 root server clusters | Incorrect. The 13 are named identities. | 13 named root-server identities, A to M |
| More than 1,500 individual servers | Stated by ICANN, as accessed in 2026. The page gives no publication date. | ICANN describes more than 1,500 individual servers across the 13 identities |
| 12 independent operators | Stated by ICANN | 12 operators run the 13 identities |
| About 1.6 million queries per second | Not verified. No named operator, period or measurement method was found. | Omit, or attribute to a named operator with a date and a stated measure (peak, average or other) |
| More than 140 K-root sites | Not verified. RIPE NCC publishes a hosted-node list, but this count was not confirmed. | Omit, or give a dated count from the RIPE NCC node list and distinguish active nodes from sites |
| One IP address for K-root | Incomplete. IANA lists an IPv4 and an IPv6 address. | K-root uses one IPv4 and one IPv6 service address, announced from distributed nodes |
A system-wide query rate and a single identity’s traffic are different measures, and each needs its own scope and date. Neither can be inferred from the number of identities or the number of servers.
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Why the root is split this way
The design separates two jobs. The 13 stable identities give resolvers a fixed starting point that rarely changes. The large number of instances, spread across operators and locations and reached through anycast, gives capacity and resilience. A failure at one node removes that node’s share of traffic, and routing carries queries to the remaining nodes announcing the same prefix, which is why the shared address does not create a single point of failure.
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The trade-off is that the identity layer is only as current as each instance’s copy of the root zone. That is why RIPE NCC’s zone monitoring and its automatic withdrawal after expiry matter more than the headline count of letters.
In short, the internet’s root is best described as a fixed set of 13 names backed by a large, distributed pool of servers, with K-root being one identity whose service is delivered from many nodes behind a single anycast address per protocol family.
For the scale and operator details, consult ICANN’s root server system page, IANA’s root servers listing, and RIPE NCC’s K-root pages, and check the publication dates on each before quoting a figure.
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