What is DNS server and why is it used?


A DNS server is really a computer server which contains a database of public IP addresses as well as their connected hostnames, and often serves to solve, or translate, individuals names to IP addresses as requested. DNS servers run special software and talk to one another using special protocols.

You might even see a DNS server known by other names, like a name server or nameserver, and your own domain name system server.

The objective of DNS Servers

The DNS server sits within the space between humans and computers to assist facilitate their communication.

It’s simpler to keep in mind a website or hostname like lifewire.com than to keep in mind the site’s Ip figures Then when you access an internet site, like Lifewire, all you need to type may be the URL https://world wide web.lifewire.com.

However, computers and network devices don’t fully trust domains when attempting to discover one another on the web. It is more effective and precise to make use of an Ip, the statistical representation of the items server within the network (internet) the web site resides on.

How DNS Servers Resolve a DNS Query

Whenever you enter an internet site address to your browsers address bar, a DNS server would go to work to obtain the address that you would like to go to. It will this by delivering a DNS query to many servers, because both versions translates another area of the website name you joined. The various servers queried are:

  • A DNS Resolver: Receives the request to solve the website name using the Ip. This server will the hard work in working out in which the site you need to go really resides on the web.
  • A Root Server: The main server receives the very first request, and returns an effect to allow the DNS resolver understand what the address from the Top Level Domain (TLD) server that stores the data concerning the site. A high level domain is the same as the .com or .internet area of the website name you joined in to the address bar.
  • A TLD Server: The DNS resolver then queries this server, that will return the Authoritative Name Server in which the website is really came back.
  • An Authoritative Name Server: Finally, the DNS resolver queries this server to understand the particular Ip from the website you are attempting to deliver.

When the Ip is came back, the web site you desired to go to will be displayed inside your internet browser.

It may sound like lots of backwards and forwards, which is, however it all happens very rapidly with little delay in coming back the website you need to visit.

The procedure described above happens the very first time you go to a site. Should you go to the same site again, prior to the cache in your internet browser is removed, you don’t need to undergo each one of these steps. Rather, the internet browser will pull the data in the cache for everyone the web site for your browser ever faster.

Secondary and primary DNS Servers

Generally, a principal along with a secondary DNS server are configured in your router or computer whenever you connect with your isp. There’s two DNS servers in situation one of these transpires with fail, by which situation the second reason is accustomed to resolve hostnames one enters.

Several openly accessible DNS servers can be found to work with. If you wish to alter the DNS servers your network connects to, see our Free & Public DNS Servers List to have an up-to-date listing, and our How you can Change DNS Servers guide.

The Reason Why You Might Improve Your DNS Server Settings

Some DNS servers can offer faster access occasions than the others. This really is frequently the purpose of methods close you’re to individuals servers. In case your ISP’s DNS servers are nearer to you than Google’s, for instance, you might find domains are resolved faster while using default servers out of your ISP compared to an exterior server.

Should you experience connection problems where it appears no websites will load, it is possible likely to error using the DNS server. When the server is not capable of finding the right Ip that’s connected using the hostname one enters, the web site can not be located and loaded.

Many people decide to change their DNS servers to ones supplied by a business they consider more reliable e.g., one which promises to not track or record those sites you visit.

A pc or device, including tablets and smartphones, linked to your router may use another group of DNS servers to solve internet addresses. These can supersede individuals configured in your router and will also be used rather.

How you can Obtain Internet Server Information

The nslookup command can be used to question your DNS server on Home windows Computers.

  • Addresses:

Within the example above, the nslookup command informs the Ip, or several IP addresses within this situation, the lifewire.com address means.

DNS Root Servers

You will find 13 important DNS root servers on the web that store an entire database of domains as well as their connected public IP addresses. The high-tier DNS servers are named A through M for that first 13 letters from the alphabet. Ten of those servers are in america, one out of London, one out of Stockholm, and something in Japan.

The Web Assigned Figures Authority (IANA) keeps their list of DNS root servers if you are interested.

Adware and spyware Attacks That Change DNS Server Settings

Adware and spyware attacks against DNS servers are by no means uncommon. Always run an anti-virus program because adware and spyware can attack your pc in a manner that changes the DNS server settings.

For instance, in case your computer uses Google’s DNS servers ( and eight.8.4.4) and also you open your bank’s website, you naturally expect that whenever one enters its familiar URL, you’ll be delivered to the bank’s website.

However, if adware and spyware changes your DNS server settings, which could happen without your understanding after a panic attack in your system, the body no more contacts Google’s DNS servers but rather a hacker’s server that poses as the bank’s website. This fake bank site might look just like the real one, but instead of logging you into your money, it harvests the password you simply typed, giving the online hackers the fundamental information they have to enter into your money.

Adware and spyware attacks that hijack your DNS server settings might also redirect traffic from popular websites to people that are filled with advertisements in order to an imitation site made to scare you into believing your pc continues to be have contracted the herpes virus, and you must buy their marketed computer software to get rid of it.

Don’t be seduced by websites that all of a sudden appear with flashing warnings suggesting your pc continues to be have contracted the herpes virus, and you must purchase some software to eliminate it. They are always scams.

Protecting Yourself From DNS Attacks

There’s two things you want to do to prevent being a victim of the DNS settings attack. The very first is to set up anti-virus software to ensure that malicious programs are caught before they are able to inflict damage.

The second reason is to seriously consider the look of important websites you visit regularly. Should you visit one and also the site looks off in some manner-most likely the images are different or even the site’s colors have altered, or menus don’t look right, or else you find misspellings (online hackers could be dreadful spellers)-or else you have an “invalid certificate” message inside your browser, it may be an indication that you are on the faked website.

How DNS Redirection Could Be Positively Used

This capability to redirect traffic can be used as positive purposes. For instance, OpenDNS can redirect visitors to adult websites, gambling websites, social networking websites, or any other sites network managers or organizations do not want their users visiting. Rather, they might be delivered to a webpage having a “Blocked” message.


How do you get the best DNS server in my area?

To check different DNS servers, make use of a benchmarking tool like GRC DNS Benchmark for Home windows and Linux or Namebench for Mac. In certain situations, you are able to considerably improve your internet speed by switching DNS servers.

How do you fix the ‘DNS Server Not Responding’ error?

If you notice the DNS Server Not Responding error, obvious the DNS cache and run Home windows Network Troubleshooter. Should you lately installed anti-virus software, temporarily disable it to find out if that can help. In the event that does not solve the issue, try switching DNS servers.

How do you obvious the DNS cache on Home windows?

Open Command Prompt and enter ipconfig /flushdns to obvious the DNS cache. You are able to obvious the cache in Microsoft PowerShell using the Obvious-DnsClientCache command.

How come there only 13 DNS root name servers?

DNS uses 13 root name servers because of the limitations of Ip Address version 4 (IPv4). The amount 13 was selected like a compromise between network reliability and gratifaction.

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