What is a Secondary DNS and why is it used?

It’s a great idea to use the Secondary DNS to keep a reliable copy of your data. You’ve most likely come to our post because you’ve heard about it and want to improve your DNS’s reliability. Yes, Secondary DNS can provide peace of mind, especially in today’s world where DDoS attacks and other DNS difficulties are widespread. So let’s go over the facts and explain things a little more.

Benefits of Secondary DNS service

What is the purpose of a Primary DNS server?

The Primary DNS, also known as the Master DNS, stores the initial zone file. It holds the DNS records and is where all changes are made.

It’s where all the initial data for a DNS zone and its associated domains comes from. As a result, everything is handled by the Primary DNS server. It maintains a list of all DNS records for its DNS zone. You can change or delete one or more records in the primary source — the Master DNS server — at any time.

What does the term “Secondary DNS” imply?

Secondary DNS, also known as Slave DNS or Backup DNS, is a fantastic service that links you to a DNS server network. They’re your primary DNS server’s backup DNS servers. Their purpose is to automatically duplicate the Primary DNS zone file. You’ll be able to store your DNS records in more places throughout the world this way. In addition, you can implement it if your Primary DNS becomes unavailable.

Primary DNS manages your Domain Name System. So, from there, you may update, add, or remove DNS records. Same or a different DNS provider may offer a Secondary DNS service. You can use various Slave DNS services to back up your Primary DNS.

In addition, having a Secondary DNS with a separate provider is a brilliant idea. That way, you’ll have a better chance of staying awake in the event of an attack.

Primary and Secondary DNS – differences

Primary DNS server contains DNS zone information. If the DNS administrator has to make any modifications or updates, they can do it on the Primary DNS server. As a result, it is the primary data source for the other servers.

There are no limits on the number of servers that can be used for Secondary DNS. It could be one or several, but they’re all connected to a Primary DNS server. The DNS zone transfer allows backup DNS servers to receive data from the Primary DNS. It is a good idea to select a different DNS provider for your Backup DNS because this reduces the chances of failures affecting the performance of their websites (attacked servers, downtime, etc.). Meanwhile, you’ve increased redundancy.

Every DNS server can function as either a Primary DNS or a Secondary DNS. Furthermore, a Primary DNS server for one DNS zone could also serve as a Backup DNS server for another zone.

Why is it necessary to have a Secondary DNS?

There are four main reasons why you should use a Secondary DNS server:

  1. Use Secondary DNS to prevent attacks. The most obvious reason is to maintain a network of backup DNS servers capable of responding to queries even if your Primary DNS server is unavailable. Because of this backup, your potential visitors will be able to enjoy an everyday experience for a long time until you can restore the Primary DNS.
  2. Using Secondary DNS may improve network performance. What does it imply? By having multiple points of presence (PoPs), you can create a load-balancing network. You can manage the traffic and distribute it across multiple DNS servers. Furthermore, you will provide faster responses, and your Primary DNS server will be less burdened.
  3. Make a backup copy of the DNS records. If your Primary server fails and all of your DNS records are lost, you can still recover them from the Backup DNS; you won’t have to start over.
  4. Good customer experience. More speed provides additional benefits to the user, such as quicker reaction times and faster load times. As a result, your company will rank higher in search engine rankings.


You now understand why secondary DNS is critical for you and your business. These benefits are not just for reading, but for putting into practice. Simply having Primary DNS is dangerous, and it can stifle your company’s growth over time. On the other hand, using a secondary DNS can protect you against this. Make sure nothing is preventing your Domain Name System from resolving. There will be no sales lost if you have 100 percent availability. So go ahead and do it!

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