The Tool Desk
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What happens first when you enter bbc.com?
The browser needs an IP address for the host it is about to contact. It asks a client-side stub resolver, which forwards the DNS question to a configured recursive resolver. The browser or operating system may have its own cached data too, but the steps below describe the resolver hierarchy rather than the behavior of a particular browser.
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The recursive resolver checks whether it has a usable answer or the delegation information needed to find one. DNS records have time-to-live (TTL) values that limit how long cached data should be reused. If the resolver can answer from its cache, it returns the data without querying DNS authorities for that lookup. DNS is hierarchical, but that does not mean every visit walks the entire hierarchy.
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| Path | What the resolver does | What happens before an address is returned |
|---|---|---|
| Cache hit | Uses an answer or relevant delegation data it already holds within its TTL. | No upstream authority query is needed for the information already cached. |
| Cache miss | Queries upstream DNS servers to obtain the missing answer or delegation data. | It follows referrals as needed until it can obtain the requested address data. |
A miss does not guarantee that every step will require a fresh query. For example, the resolver might lack the final address record but already have valid delegation information for .com or the domain. It can use what remains in cache and query only for what is missing. The exact path therefore depends on the resolver’s cache at that moment.
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How a cold-cache lookup under .com can climb the hierarchy
As an illustration, suppose the recursive resolver needs information for a name beneath .com and has no relevant data cached. The lookup can proceed through referrals:
- Root: The resolver asks a root server, which refers it to the nameservers for
.com. - .com: A
.comnameserver refers the resolver to the authoritative nameservers for the domain. - Domain authority: An authoritative server for the domain supplies the requested address record.
- Return and cache: The recursive resolver returns the answer to the client and caches received data according to its TTL.
These referrals tell the resolver where to ask next. They do not choose the network route the browser’s later connection will take. Nor does this cold-cache illustration establish which servers a particular bbc.com lookup contacts: that depends on the resolver and its cached data, and the records can vary over time.
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What “13 root servers” means
The phrase refers to 13 named root-server identities, not 13 individual machines or 13 competing services. ICANN says 12 independent operators manage those identities and that more than 1,500 individual servers are associated with them across the globe. The root system provides referrals into the DNS hierarchy; it does not need to be contacted for every lookup.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.TTL and query minimization affect what happens upstream
TTL controls reuse
A TTL limits how long a resolver should reuse cached DNS data. While relevant data remains usable, another query can benefit from it; after it expires, the resolver needs fresh information. Different pieces of the lookup can have different cache states, so expiry of one record does not necessarily mean the resolver must repeat every step from the root.
QNAME minimization can limit name disclosure
Query Name Minimization (QNAME minimization) can reduce how much of the queried name a recursive resolver sends to upstream servers. Its use depends on resolver behavior, so it should not be assumed that every resolver uses it or that every upstream server sees the same query name.
What this means for the browser
DNS resolution supplies address data; it is separate from the browser’s later connection to the destination. Once the resolver returns usable address data, the browser can begin opening a connection. A root referral is part of finding DNS information, not a direction for the browser’s traffic. The particular records and servers involved in a live bbc.com lookup cannot be inferred from the domain name alone.
Quick Recap
Sources
- ICANN: ICP-3: A Unique, Authoritative Root for the DNS
- ICANN: RSSAC FAQ
- ICANN: The Root Server System
- IETF: RFC 9076, DNS Privacy Considerations
- ICANN Governmental Advisory Committee: RSSAC and the Root Server System, ICANN85 (2026)
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