Certificate SAN Explorer

Connect to a TLS endpoint and list the DNS names published in its certificate Subject Alternative Name extension.

Results

No certificate lookup run yet.

Related Tools

Subdomain Finder

Search certificate transparency data for related hostnames.

DKIM Selector Finder

Try common selectors and discover likely DKIM records.

Hosted Service Fingerprint Finder

Identify likely hosted platforms and services from DNS clues.

Related Articles

What Is a Subject Alternative Name in TLS?

Learn what a subject alternative name is in a TLS certificate, why SANs matter for hostname validation, and how SAN data helps with discovery and troubleshooting.

How Certificate Transparency Helps Find Subdomains

Learn how certificate transparency logs help find subdomains, what the data misses, and how to interpret CT-based hostname discovery safely.

How to Read CAA Records Correctly

Learn how to read CAA records, understand issue, issuewild, and iodef tags, and tell whether certificate issuance is properly restricted for a domain.