DNS Anycast

Netnod has more than a decade of experience running DNS anycast services with 100% uptime for some of the world’s largest TLDs and enterprise networks. Our industry-leading anycast network has one of the largest server footprints in the world. This means we can guarantee resilience and redundancy as well as significant improvements in DNS response times, security and management.

But how does anycast work, who uses it and what benefits can it bring to your business? To find out, see the short explanations below.

What is anycast?

Anycast is a network addressing technique enabling servers around the world to share the same IP address. When used for DNS, anycast ensures that your customers have a quicker, more reliable experience and that your web services are more resilient, secure and easier to manage.

How does it work?

Anycast shifts redundancy management from the DNS to the routing layer. Instead of just one route to your presence, anycast provides multiple routes. This ensures that user requests are always routed to the closest available server. When you use an anycast network with a comprehensive global footprint, your services are more immediately available to users all over the world.

Who uses anycast?

Anycast is used by Top Level Domains (TLDs) and enterprise networks with customers connecting to their services from all over the globe. These organisations rely on anycast to ensure their services are always available and not affected by outages associated with a single point of failure or DDoS attack.  

Anycast is also used by DNS root zone operators, such as Netnod, who operate one of the 13 root name servers. The root name servers are the entry points to the Domain Name System (DNS) and are a critical part of the Internet’s infrastructure. By using anycast, the root name servers are present at more than 1,300 locations around the world.

What are the benefits of anycast DNS?

Adding a reliable anycast network to your existing DNS solution is simple: you add each anycast network as if you were just adding one extra name server. Once you have done this, anycast provides the most cost-effective way to:

- Ensure redundancy and resilience

Anycast allows for multiple instances of a name server to be distributed across the world. If one anycast instance is unavailable, the system automatically reroutes queries to the best available location. Using anycast is one of the best things you can do to protect your business from DDoS attack.

- Reduce latency

The distributed nature of an anycast network means users’ queries are routed to the closest available instance of a name server. This gives significantly improved response times.

- Simplify your DNS management and save money

There is no need to configure each location separately. With anycast DNS, you seamlessly maintain identical data sets at all instances of your name server across the world.