Generate DNS CAA records to restrict SSL/TLS certificate issuance.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Type your domain (e.g. example.com).
Toggle Let's Encrypt or DigiCert and wildcard support.
Add the generated CAA records to your DNS provider (Cloudflare, Route53).
A DNS CAA record specifies which Certificate Authorities are allowed to issue SSL certificates for your domain.
iodef specifies an email address or URL where CAs send reports if an unauthorized certificate request is attempted.
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