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The Domain Name System

DNS is the name of the service and method by which domain information and records are organized, stored, transferred, and utilized by server and client devices. Most users understand DNS as what converts a domain (such as google.com) into an IP address (such as 216.58.192.46). Server administrators typically understand this a bit more in-depth, and realize that a DNS ‘A’ record is required to convert the user-friendly name of google.com into its corresponding IP address. Client machines will then look for a cached copy of this record and use that. If none exists, a live lookup is performed on the DNS ‘zone’ for google.com, the IP address discovered, and then cached for future use.

 

A DNS record can be set up on any server that is running what is called a nameserver service. The nameserver service is responsible for organizing and serving DNS queries for your domain. A server running a nameserver service can also be called, coincidentally, a nameserver. One responsibility of your domain registrar (Enom, CloudFlare, 1&1, etc.) is to dictate which nameserver(s) are responsible for the DNS records of your domain. These are called authoritative nameservers. Authoritative nameservers can only be set at the registrar, though most registrars can provide services to update this information via API.


At 100TB.com we provide a fast and fully-redundant DNS nameserver service which can be used to host your domain name configurations and to manage them within your 100TB.com Tera account. This saves you administrative overheads and effort in configuring your own nameservers.

To use the 100TB.com nameserver service, log in to your registrar and assign the below as authoritative nameservers:

 

 

ns1.extns.net (67.228.254.4)

ns2.extns.net (67.228.255.5)

 

Once our nameservers are authoritative for your domain, you will be able to add the domain’s zone file into your Tera panel at cp.100tb.com. This is done via Apps >> DNS >> Add Domain. You will be asked for an initial IPv4 address; think of this as the IP address that visitors will use to access yourdomain.com. Once the DNS zone has been created, you will be able to add ‘A’, ‘AAAA’, ‘CNAME’, ‘MX’, and ‘TXT’ records through your Tera panel.

 

Why does DNS take so long to change?

In short, this is because DNS records are cached in order to optimize the speed of website page requests. Your computer does not look for a new record until the expiration time set for the old record is reached!

If a domain name request does not update immediately from your location, this is because the TTL record (that is the Time-To-Live - a time limit, usually in seconds) that was previously set in a domain name’s DNS record has not yet expired. Often, this time limit is set to 24 or 48 hours to increase caching potential (consequently increasing the speed of website loading times) and reduce load on the authoritative nameservers.

 

Reverse DNS / Pointer Record

Reverse DNS (a.k.a rDNS or PTR) is the reverse domain-lookup record for an IP address. This record is set by your server hosting provider. For servers hosted with 100TB.com you are able to set PTR records in your Tera panel (Apps >> My Servers >> double click a server >> Network >> RDNS). Our support team will also be happy to set PTR records for you - feel free to send us a support ticket and we’ll action it right away! 

This record is often used by email recipients to verify the authenticity of incoming email, so by setting an rDNS record which corresponds to your server’s hostname it will greatly reduce the chances of your outgoing email as being marked as spam when it is received.