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DNS CAA Record | Glossary

A CAA (Certification Authority Authorization) record specifies which certificate authorities (CAs) are permitted to issue SSL/TLS certificates for a domain. If no CAA record exists, any CA may issue a certificate for your domain.

Why it matters: CAA records reduce the risk of mis-issued certificates by preventing unauthorised CAs from issuing certificates for your domain — even if a CA is compromised.

Quick tips:

Add a CAA record listing only the CAs you use (e.g. 0 issue "letsencrypt.org").
Use issuewild to separately control wildcard certificate issuance.
Use iodef to receive email reports of any unauthorised issuance attempts.