Domain Name Server (DNS) Management Guide


What is a Domain Name Server (DNS)?

Domain Name Servers or DNS are the Internet’s equivalent of a phone book, translating domain names into Internet Protocol (IP) addresses. Although computers or machines access websites based on their IP address, people can remember an easier web address such as than an IP address like


What are subdomains?

A subdomain is subdivision of a domain name, allowing you to put content in your URL before your namespace. For example or would be a subdomain of the domain name

For example: If a customer buys a domain with 123-reg, e.g., they can set up subdomains, e.g. or This is an excellent way of breaking up the website if you have different regions, products or even languages.


What are nameservers?

A nameserver maintains a directory of domain names that match certain IP addresses. In other words, it’s where the DNS server records for your domain are stored, allowing you to decide which hosting providers controls your webspace and email.

All domain registrars should provide you with the ability to change at least two nameserver entries on your domain name, and hosting companies should offer you at least two nameservers to point to.


For more information please view our DNS Management Guide

One of the advantages of registering your domain name with 123-reg is that you are free to change the nameservers to other hosts whenever you like. However, if you choose not to point to our nameservers, you won't be able to use our web and email systems to configure your domain name, nor will you be able to use our hosting solutions.

Please note: If you change the DNS to another registrar, you will no longer be able configure your DNS changes for that domain within your control panel.

You can check the current DNS settings for your domain name at


How to check nameservers

The simplest way to check the nameservers your domain is on is to go to, type in your domain name into the box and click on the lookup button. This will show you a section that lists your nameservers.


How to change nameservers

You can change the nameservers of your domain name from the 123-reg control panel. Check out our useful guide for step-by-step instructions.


How to set up an A record

The A (Address) record is used to point your domain at an IP address. To set it up, you will need an IP address from your provider. Please refer to our guide for complete instructions on how to set up an A record.


How to set up a CNAME record

Our support guide includes all the steps you need to follow to set up a CNAME (Canonical Name) record. Keep in mind that you will first need a URL address such as from your provider.


How to set up a TXT record

The TXT record is commonly used for SPF records but it can also be used for tasks such as validating your domain name with Google. Download our handy guide for complete instructions on how to set up a TXT record.


How to set up an SPF record

A Sender Policy Framework (SPF) record is used for identifying which mail servers are allowed to send email in behalf of your domain. The main purpose is to prevent spammers from sending emails with forged From: addresses at your domain. For detailed information on how to set up an SPF record for your domain name, please refer to our support guide.


How to set up an MX record

A Mail Exchanger (MX) record specifies which mail servers are responsible for a specific domain name. Download our guide for more information and to learn how to set up an MX record.


How to point a domain to your own mail server

Our support guide includes complete instructions on how to configure your domain name to point to your own mail server so make sure you check it out.

Download this useful guide to learn the basics of Domain Name Server management.


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