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Domain name resolution is the DNS process of finding a record associated with a domain name—often the IP address a device needs to connect to a website. A recursive resolver handles the request for your device, using cached information when possible or following DNS referrals when it needs to find an answer.
What happens during domain name resolution?
A typical DNS lookup begins when a browser or another client asks its configured recursive resolver for a record associated with a name. For an uncached lookup, the resolver may follow referrals through the DNS hierarchy until it reaches a server that can answer for the domain.
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- The client asks a resolver. Your device sends a DNS request to its configured recursive resolver, asking for a particular record.
- The resolver checks its cache. If it has a usable cached answer, it can return that answer without repeating the full lookup. Cached data remains usable only for a limited time. Google explains DNS caching.
- The resolver may ask a root nameserver. If it needs to find the answer, it can query a root nameserver, which points it toward the nameservers for the relevant top-level domain, such as
.com. - A TLD nameserver points toward the domain. The top-level-domain (TLD) nameserver refers the resolver to the domain’s authoritative nameserver.
- The authoritative nameserver answers. It provides the requested record for a zone it serves. The resolver returns the result to the client, which can use an address record to connect to a service. Cloudflare describes the roles of these DNS servers.
This is a useful model for an uncached lookup, not a guarantee that every request contacts every type of server. A cache hit can shorten the process, and an alias such as a CNAME can require the resolver to look up another name.
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- Recursive resolver: The client’s intermediary. It returns a record or an error, doing any additional lookup work needed and sometimes answering from cache.
- Root and TLD nameservers: They provide referrals that help the resolver move through the DNS hierarchy toward the right domain.
- Authoritative nameserver: It supplies records for a DNS zone for which it is authoritative. It is not the same thing as a public recursive resolver. Google states that “Google Public DNS servers are not authoritative for any domain” in its Public DNS FAQ.
In other words, a resolver finds or retrieves an answer on a client’s behalf; an authoritative nameserver provides the records for its zone.
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Recursive versus iterative DNS queries
A recursive query asks a resolver to return the final answer or an error. An iterative query can receive a referral rather than the final answer, then continue by querying another server. The resolver commonly handles those steps for the client. Google’s DNS introduction explains the query distinction.
Why a DNS lookup may not be one direct name-to-address step
DNS can return different kinds of records, not just an IP address. For example, a CNAME record makes one name an alias of another. The resolver may then need to find the record for the target name as well. So “translating a domain into an IP address” is a helpful shorthand for many website visits, but the actual lookup depends on the record requested and the records returned. See Cloudflare’s explanation of CNAME records.
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Is domain name resolution encrypted?
Not necessarily. Google says, “Traditional DNS queries and responses are sent over UDP or TCP without encryption.” DNS-over-TLS encrypts the connection between a client and its resolver; it does not mean that every segment of resolution is encrypted, and it complements rather than replaces DNSSEC. Read Google’s DNS-over-TLS documentation for details.
What domain owners should check before changing nameservers
If you administer a domain, check that its required DNS records are in place before activating it with new nameservers. Cloudflare warns that a domain may become unreachable if it is activated without the correct records. Its full-setup guidance covers the transition.
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Choosing a recursive resolver
There is no universally best resolver established by the sources here. Google lists speed, reliability, security, and validity of responses as factors to consider. Performance can vary by network and location, so a provider’s general claims do not establish which option will be fastest for you. Compare a resolver’s practices and behavior on your own connection; Google’s resolver FAQ outlines the criteria.
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