Best Practices for Recursive DNS

Best practice 1

Recursive DNS is the lookup role that handles requests from clients and goes out to find the answer if it is not already cached.

Cloudflare describes the recursive resolver as the first stop in a DNS query and the middleman between the client and other DNS servers.

A recursive resolver receives the client’s DNS query. If it does not already have the answer cached, it asks other DNS servers as needed until it finds the right result.

It then returns that answer to the client.

Best practice 2

Recursive DNS matters because it is part of almost every normal internet lookup.

Performance, cache quality, filtering, and privacy posture of the recursive resolver can all affect the user experience.

A common misconception is that recursive DNS and authoritative DNS are the same thing. They are different roles in the DNS system.

Another misconception is that DNS queries always go straight from the user to the authoritative source. In normal use, the recursive resolver usually sits in the middle.

Best practice 3

A common misconception is that recursive DNS and authoritative DNS are the same thing. They are different roles in the DNS system.

Another misconception is that DNS queries always go straight from the user to the authoritative source. In normal use, the recursive resolver usually sits in the middle.

The simplest rule to remember

The best practices around Recursive DNS usually make the most sense when they are tied to real-world goals like reliability, security, performance, or clarity.

That is why understanding the purpose of Recursive DNS matters as much as memorizing its definition.

Related questions

What to learn next

Sources

• Cloudflare: What is recursive DNS?
• Cloudflare DNS server types