CERT Lookup

Query CERT records to retrieve certificate information stored in DNS

CERT records store certificates and related data in DNS, enabling certificate distribution and validation through the DNS infrastructure.

Domain Lookup

Enter a domain name to query its CERT records

What are CERT Records?

CERT (Certificate) records are DNS resource records that store certificates and related cryptographic information in the Domain Name System. They enable the distribution of certificates through DNS infrastructure, providing an alternative method for certificate discovery and validation.

Key Components:

Type: Specifies the certificate format (1 for PKIX, 2 for SPKI, 3 for PGP, etc.)
Key Tag: A short numeric value that identifies the certificate
Algorithm: The cryptographic algorithm used (RSA, ECDSA, etc.)
Certificate: The actual certificate data in binary format

How CERT Records Work:

Applications query DNS for CERT records of a specific domain
DNS server returns available certificate information
Client validates the certificate using standard PKI procedures
Certificate can be used for encryption, authentication, or digital signatures

CERT records are defined in RFC 4398 and provide a standardized way to distribute certificates via DNS.

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