Anycast DNS: History & Advantages

If you still don’t use Anycast DNS, pretty sure you have heard network administrators talking about it. If it’s about getting better performance, uptime, or faster DNS resolution for your domain, Anycast DNS is popular and good advice.

What is Anycast DNS?

Anycast is a network method for addressing and routing. DNS adopted it, so Anycast DNS is the possibility of having a single IP address and multiple name servers in different locations that can provide it when requested.

The objective of having name servers in different locations is to be closer to users worldwide. Let’s think a user requests a domain so he or she will get an answer from the nearest name server that has the same IP address. A shorter distance will require a shorter route. This will result in higher speed for the DNS domain resolution and a considerable latency reduction.

History of Anycast.

Anycast has existed since 1989, but it was until 1993 that the Internet Engineering Task Force (IETF) properly documented this routing method in the RFC 1546, “Host Anycasting Service”. That document described how this method improves the performance of a network and provides what they called “autoconfiguration of DNS resolvers”.

Back then, only some servers supported Anycast addresses. Others directly discarded data packets heading to Anycast addresses. Another issue was that some servers managed to intercept communications and deviate traffic to themselves by forging their IP address. But technology evolved and DNSSEC got born and solved these security problems.

By 1999, Anycast had already started working with IPv6. And during the 2000s, root DNS servers used Anycast DNS to enhance redundancy.

Before, when the Internet and its traffic were smaller, Unicast worked ok. This routing method was a one-to-one way, meaning data were sent from a source (node) to only a destination.

Advantages of Anycast DNS.

Quicker DNS response.

With more and worldwide distributed DNS nameservers, answers to DNS queries are faster. The closest server will give these answers to the location where the DNS queries originated.

Effective redundancy.

Having only one nameserver can be risky and cause downtime if this server fails. But Anycast DNS means a network with multiple nameservers. Since all of them can lead users to the same IP address, if a server fails, there will be more Anycast DNS servers that can give a proper answer.

Load balancing.

With more than a single server, the possibility of distributing the traffic is real. There’s no need to stress one or another server. This is not a minor advantage! Just think about DDoS attacks. To prevent big loads of traffic, either malicious or legit (like sudden spikes due to high season, special sales, etc.), can make your servers struggle is a great advantage.

Scalability when you need it.

Quality providers of Anycast DNS allow you to add or remove servers easily.


Anycast DNS offers big advantages for your online business. Fast speed, reliable service, and constant uptime for your clients. It’s worth a try, isn’t it?

Get familiar with the most popular DNS record types

Today, we’ll look at the most important and fundamental DNS record types that everyone in this field should be aware of. To begin, DNS records are text files containing computer instructions. Furthermore, DNS servers store DNS records, which we use to connect websites to the outside world. So, let us now look at the most important ones.

A record

The A record, commonly known as an address record, comes first on our list. It is unquestionably the most popular form of DNS record. We utilize an A record to point a hostname to its IP address. We’re referring to IPv4 addresses (32-bit) when we discuss it. Also, a more recent AAAA record type uses IPv6 addresses (128-bit).

As a result, the A record for your website will include the host’s domain name (, IPv4 address, type (A), and TTL (time to live). It is the DNS record that is used the most.

NS record

The NS record represents yet another crucial DNS entry. The NS stands for nameserver. Furthermore, it functions as the nameserver’s ID card. And it specifies which NS server manages the DNS zone. Without it, the zone will be ineffective.

You must include the host in the NS record, just like in the A record. This time, though, you will direct it to the nameserver.

PTR record

The polar opposite of an A Record is a PTR Record. A Record maps a fully qualified domain name to an IP address, whereas a PTR Record does the inverse. It checks whether the server name is correctly associated with the IP address.

You must set up PTR records before using email servers. This will assist you with anti-spam, eliminating the problem with email delivery brought on by PTR record issues, logging, and a host of other things.

CNAME record

An informational component of a domain name system is a CNAME record. For example, the www prefix is often a CNAME record pointing directly at the domain, if you have ever visited a website with the prefix. One hostname is mapped to another domain using CNAME records, giving the second domain an alias. CNAME records are crucial as a result.

SPF record

TXT is one of the DNS resource records. It is mostly used to indicate facts about the area and give outside sources information. To authenticate emails, you must have it. For instance, a server sends an email to your internet service provider (ISP). The ISP can use an SPF record or dedicated TXT type record to authenticate the email. This record includes information on the trusted servers approved by your domain so that your ISP can determine the origin of an email and spot a forgery. SPF, or Sender Policy Framework, is the most common (but not the only) email authentication method.


Felicitations! You are now familiar with the fundamental DNS record types. Knowing them is vital if you want your Domain Name System to work properly. So, the best is yet to come.