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DNS Zone

A DNS zone is the administratively managed collection of DNS records for a domain or other portion of the DNS namespace.

A DNS zone is the administratively managed collection of DNS records for a particular portion of the DNS namespace.

In everyday website administration, the zone often corresponds to the records managed for a domain such as:

example.com

What a Zone Contains

A DNS zone may contain records for:

  • The root domain
  • www
  • Email
  • Verification
  • Subdomains
  • Third-party services
  • APIs
  • DKIM
  • DMARC
  • Other services

For example:

A       @       192.0.2.10
CNAME   www     example.com
MX      @       mail.example.net
TXT     @       verification-value

Cloudflare's DNS documentation describes DNS records as the information used to make domain resources available to websites and other internet services. Cloudflare DNS-record documentation

Zone vs. Domain

The **Domain Name** is the registered human-readable name.

The DNS zone is the technical configuration managed by the authoritative DNS provider.

They are related but not identical.

Zone Apex

The highest name represented directly by a DNS zone is commonly called the zone apex.

For the zone:

example.com

the apex is:

example.com

Many DNS interfaces represent the apex using:

@

Cloudflare documents @ as the common interface notation for the zone apex in DNS management.

Why It Matters

When moving DNS providers, the zone is what needs to be recreated accurately.

Missing even one important record can affect:

  • Website availability
  • Email
  • Verification
  • External integrations
  • Subdomains

Common Problems

Common problems include:

  • Only copying web records
  • Missing email authentication records
  • Old service records retained forever
  • Duplicate records
  • Unclear comments or ownership
  • Nobody knowing why a TXT Record exists

How to Improve

Maintain a simple DNS inventory.

Where the provider supports it, document:

  • Purpose
  • Owner
  • Related service
  • Last reviewed date

Remove records only after understanding what depends on them.