All details you need to know about Anycast DNS

An explanation of Anycast DNS

Fast data transmission and reception are made possible by Anycast DNS, a type of communication or routing technology. Using this technique, a single IP address can be typed into several DNS servers worldwide. Any of them can reply to the request, and often, it is the server that is located closest to the user. This dramatically accelerates the response time (DNS resolution).

How does it operate effectively?

When a device connects to the Internet, it uses its IP address to communicate with a server. This happens in one-to-one communication, which is the most fundamental type. This is acceptable, and DNS resolution may function, but if there is only one server with the information (an A record or an AAAA record) to answer. That server is located far away, some requests will have to travel great distances to get to it. The user won’t get the anticipated response if the server is down. Nobody will answer the question.

What benefits does using Anycast DNS offer?

Among the numerous advantages are the following:

  • Just configure it on one server, and it’s easy to set up. Additionally, the network as a whole can be affected by such alterations.
  • Enhanced response time — By directing to the closest reachable DNS server, the response time is accelerated.
  • DNS Dependability – By putting up numerous servers with the same IP address in various locations, you can increase DNS reliability by using Anycast. The service is more highly available and dependable due to the DNS servers’ redundancy.
  • Protection against DDoS attacks: If a DDoS attack happens, just a section of the Anycast DNS group of servers will be impacted.

Various routing techniques

There are various methods you can use to send or receive data. However, each has specific criteria that are put into practice in distinct contexts.

  • A one-to-one communication mechanism is Unicast. This is the simplest method for sending all visitors to a single website.
  • In many aspects, Anycast and Unicast are similar. However, there is one key distinction: there are numerous hosts. The nearest host will therefore receive the inquiry as a result.
  • Most people are familiar with the term “Broadcast” thanks to television and radio. In this system, the data is transmitted from one point to all.
  • Although not to everyone, Multicast is also one-to-many. The idea of multicast DNS was initially put up in the IETF in 2000, and thirteen years later, it was finally released as a standards track. Only a tiny portion of people are interested in the traffic. In this case, type is helpful in the absence of local nameservers.

Recommended article: Managed DNS – Definition & Benefits


Let’s do a review. A method for traffic routing called AnycastDNS is used to quickly distribute website content that advertises specific IP addresses across several nodes. Based on variables, including your server’s capacity and health, as well as the distance between it and website visitors, user requests are sent to specific nodes.

Leave a Reply

Your email address will not be published. Required fields are marked *