When you type a domain name into your browser, a lookup happens in the background within a fraction of a second, handled by DNS, the domain name system. It is the address book of the internet that turns memorable domain names into server numbers.
In short
- DNS turns a domain name into a server IP address.
- A name server is a server that answers these queries.
- Name resolution usually takes milliseconds.
- Changes to records can take hours to appear everywhere.
What DNS is
DNS stands for Domain Name System. People remember names such as yourcompany.fi, but servers identify each other with numeric IP addresses. DNS sits between the two and translates the name into an address automatically every time you open a page.
How name resolution works
When you open a web page, the browser asks a name server which IP address the domain points to. The lookup happens in steps.
- The browser first checks its own cache.
- If the address is not found, the query goes to a name server.
- The name server returns the IP address linked to the domain.
- The browser connects to the server and loads the page.
What a name server is
A name server is a server that holds a domain name's DNS records and answers queries about them. A domain is usually assigned at least two name servers so the service keeps working even if one is under maintenance. Name servers tell the internet which server is responsible for your site and your email.
DNS records in brief
A name server holds different records for different purposes. An A record points to a server IP address, an MX record routes email and a CNAME record makes an address an alias of another. We collected the record types into their own guide.
DNS records A, CNAME, MX and TXT explained
How long DNS changes take
When you change a domain's name servers or records, the change does not appear everywhere at once. Old data may sit in caches, and full propagation typically takes anywhere from a few minutes to a few hours. This is called DNS propagation.
Manage your domain's DNS
In Nordweb DNS management you edit records from a clear interface.
Explore DNS managementFrequently asked questions
What does DNS do?
DNS turns a domain name into a server IP address so the browser can find the right server.
Why is my site not visible right after I buy the domain?
This is often DNS propagation. New data can take a few hours to spread fully.
Can I change name servers myself?
Yes. Name servers are changed in the domain management view. The change takes effect after propagation.