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TroubleshootingBeginner
Subject Alternative Names (SAN)
Master SANs for multi-domain certificates. See SAN types: DNS, IP, email, and URI with real examples.
Interactive Demo
Does Your Domain Match?
Enter a domain to test against certificate SANs
Match Found!
"www.shop.example.com" matches at least one SAN entry in this certificate.
Certificate SANs
DNS:example.comDNS:www.example.comDNS:*.example.comDNS:api.example.comDNS:*.shop.example.comMatch Results
DNS:example.comDNS:www.example.comDNS:*.example.comDNS:api.example.comDNS:*.shop.example.comKey Rule
Wildcards (*.example.com) only match ONE subdomain level. They don't match the bare domain or multi-level subdomains.