You type a website name, press Enter, and a page appears. But how does your computer know where to connect?
The answer begins with DNS—the Domain Name System. It helps your device find the network addresses associated with a domain name.
DNS supports everyday browsing, email, and many other internet services. Understanding how it works also makes website troubleshooting easier.
In this Webmind guide, we’ll explain the process and explore five demonstrations using a browser and Windows PowerShell.
Start with a Website Name
Open Chrome and enter:
You have entered a memorable domain name rather than a numerical server address.
Before your browser can attempt a connection, it needs an address for the hostname. It may obtain that information from a cache or through a DNS lookup.
After that, the browser still needs to connect to the destination, establish HTTPS encryption, and request the page.
Demonstration 1: Enter the website address in Chrome and observe the result. This shows the everyday action that DNS helps support; it does not display the lookup itself.
1. What Is DNS?
DNS is a distributed naming system. For web browsing, one of its main jobs is finding IP addresses associated with hostnames.
People find names such as 2743.com easier to remember than numerical addresses. Network connections use IP addresses to reach their destinations.
Think of DNS as a directory: you provide a name, and it helps find information about where to connect.
However, DNS is not one enormous database on a single computer. Different organizations manage different parts of the system, and DNS resolvers help find the answers.
A domain name is only part of a web address
Consider this example:
The address contains several parts:
- https specifies the connection scheme.
- example.com is the hostname.
- /about identifies a resource on the website.
DNS looks up the hostname. It does not use the page path to locate the server.
DNS also does not deliver the website’s content. It supplies information that helps the browser reach the service.
2. What Does a DNS Answer Look Like?
On Windows, open PowerShell and enter:
nslookup -type=A 2743.comAn A record contains an IPv4 address. This is the familiar format with four groups of numbers separated by dots.
Next, request IPv6 address records:
nslookup -type=AAAA 2743.comAn AAAA record contains an IPv6 address. IPv6 addresses use hexadecimal characters separated by colons.
A domain can have A records, AAAA records, or both. If no AAAA record is returned, that alone does not mean the website is broken.
Demonstration 2: Compare the domain name in Chrome with the address records returned in PowerShell.
How to read the results
At the top of the output, Server and Address identify the DNS server being queried. They are not necessarily the website’s server.
The answer section contains the requested domain’s results.
You may see “Non-authoritative answer.” This means the responding server is not the authoritative source for the domain. It does not automatically mean the answer is incorrect.
A domain can return multiple addresses. Different domains can also share one address, and results may change over time.
Can you open a website using only its IP address?
Sometimes, but it is not a reliable substitute for using the domain name.
A server may host several websites and need the hostname to select the correct one. HTTPS certificate checks also normally depend on the hostname.
Use the domain name when testing normal website access.
3. How Does a DNS Lookup Work?
The process often begins with a cache in your browser or operating system. A cache temporarily stores information so it can be reused.
If a usable answer is unavailable locally, the request goes to a recursive resolver.
This resolver may be provided by your internet service provider, your organization, or a public DNS service. Some browsers can use a separately configured resolver.
The resolver checks its own cache first. If it needs more information, a simplified lookup for a .com domain follows three stages.
Stage One: Ask a root name server
The root server normally does not return the website’s final address.
Instead, it provides a referral to the name servers responsible for the .com top-level domain.
Stage Two: Ask a top-level domain name server
A top-level domain is the ending of a domain name, such as .com, .org, or .net.
For our example, a .com name server provides a referral to the domain’s authoritative name servers.
Stage Three: Ask an authoritative name server
An authoritative name server publishes DNS records for the zone it serves.
Depending on the question and configuration, it can return an address record, an alias, or another appropriate response.
The resolver returns the result to your device, allowing the browser to attempt a connection.
Cached information can let the resolver skip parts of this process. Aliases or additional delegations can require extra lookups.
Find a domain’s name servers
Run:
nslookup -type=NS 2743.comNS stands for name server. These records identify servers associated with the domain’s DNS delegation.
Demonstration 3: Display the returned name server records and compare them with the lookup sequence:
Device → Recursive Resolver → Root Name Server → .com Name Server → Authoritative Name Server
The command shows NS records. It does not trace every exchange in that sequence.
4. Why Does DNS Use Caching?
Looking up the same information repeatedly would create unnecessary traffic and delays.
Caching allows answers to be reused for a limited time.
DNS records have a time to live, usually shortened to TTL. This value indicates how long a record may be cached.
To inspect an address record and its TTL, run:
Resolve-DnsName -Name 2743.com -Type A -DnsOnlyLook for the Name, Type, TTL, and IPAddress columns.
Demonstration 4: Observe the TTL, wait a few seconds, and repeat the query.
The displayed TTL may represent the remaining lifetime of a cached answer. It may decrease, refresh, or vary between responses. It is not necessarily the original value configured by the domain owner.
Why DNS changes do not appear everywhere immediately
After DNS records change, some resolvers may still hold older answers.
One visitor may receive the updated address while another receives an older cached result.
People often call this DNS propagation. Much of the waiting involves cached information reaching the end of its permitted lifetime.
Clearing your computer’s DNS cache affects your computer. It does not clear caches held by other resolvers.
5. DNS Does More Than Find Website Addresses
DNS supports several record types, each serving a different purpose.
| Record Type | Common Purpose |
|---|---|
| A | Associates a name with an IPv4 address |
| AAAA | Associates a name with an IPv6 address |
| CNAME | Creates an alias to another name |
| MX | Identifies mail servers for a domain |
| TXT | Stores text used for verification and other purposes |
| NS | Identifies name servers |
A website can load successfully while email fails because its mail-related records are incorrect.
Similarly, changing website hosting does not necessarily mean you should change every DNS record.
DNS security and website security are different
DNSSEC uses digital signatures so validating resolvers can check the authenticity of signed DNS data.
It does not encrypt website traffic or guarantee that website content is safe.
DNS over HTTPS encrypts the DNS exchange between a device and its chosen resolver.
Website HTTPS protects a different connection: the browser’s communication with the website.
These protections address different parts of the process. A successful DNS lookup does not prove that a website is trustworthy or secure.
6. What Happens When DNS Fails?
For a controlled demonstration, run:
nslookup -type=A webmind-demo.invalidThe .invalid ending is reserved for names intended to be invalid. It is useful for demonstrating failure without relying on a real website going offline.
Demonstration 5: Compare the failed lookup with the earlier lookup for the website.
The exact wording can vary. Different errors have different meanings:
- Name does not exist: The response reports that the requested name is nonexistent.
- Timeout: An answer did not arrive in time.
- Server failure: The resolver could not complete the lookup.
A timeout should not be described as proof that a domain does not exist.
A website error is not always a DNS error
If DNS returns an address but the page still does not load, other possible causes include:
- A connection problem.
- An unavailable web server.
- An HTTPS configuration problem.
- A website application error.
A DNS answer confirms that the lookup returned information. It does not guarantee that the destination is reachable or functioning correctly.
The useful question is: Which stage failed—finding the address, connecting to the destination, or retrieving the page?
7. What Website Owners Should Check
Before editing DNS records, identify which service manages your domain’s authoritative DNS.
Your domain registrar, DNS provider, and web hosting provider may be different companies.
Check that:
- Website address records match your hosting provider’s instructions.
- Email records remain correct when moving the website.
- Aliases point to the intended names.
- Existing cached answers are considered when testing changes.
- You have saved a copy of the current records before editing them.
Avoid changing unrelated records while troubleshooting one service.
For a WordPress website, DNS helps visitors reach the hosting destination. WordPress then handles the website’s content and application behavior.
Correct DNS records are essential, but they do not replace reliable hosting, software maintenance, backups, or website security.
Keep Exploring with Webmind
DNS connects memorable names with the information devices need to reach internet services.
Recursive resolvers find answers, authoritative servers publish records, and caches reduce repeated work.
The next time a website fails to open, you will have a clearer starting point for understanding the problem.
Watch the accompanying Webmind video to follow the five demonstrations. If it helps, please like the video and subscribe to Webmind.
Which topic should we explain next—domain names, web hosting, or HTTPS? Let us know in the comments.
Thanks for reading and watching Webmind. Goodbye, and see you next time!