Records with the same name

Occasionally, Cloudflare will not allow you to create new DNS records with the same value in the Name field.

This error can occur due to the special requirements of CNAME records¹.

Causes

You will encounter this error if you try to do one of the following:

• Create a CNAME record with a Name matching the name of an existing A/AAAA² or CNAME record.
• Create an A/AAAA record with a Name matching the name of an existing CNAME record.

Cloudflare prevents you from creating this combination of records because if a CNAME record is provided for a hostname DNS servers expect only that CNAME record to provide DNS information for that hostname.

Adding additional records would send conflicting information to DNS servers. For a technical explanation of the mechanism behind this, refer to RFC 1034.

Solution

Review your existing DNS records to find the matching value in the Name field. Then, decide whether you want to keep the current record or delete it and make a new one.

Note

CNAME records are the only IP resolution record with this type of limitation. You can have more than one A/AAAA record per hostname, which is a way some domains do simple load balancing for incoming requests.

Footnotes

1. CNAME records map a domain name to another (canonical) domain name. They can be used to resolve other record types present on the target domain name.

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2. A and AAAA records map a domain name to one or multiple IPv4 or IPv6 address(es).

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