SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

oncora.cz

SSL/TLS Certificate

WhoisRDAPDNS RecordsCertificateUptimeDiagnosticsHistoryHide Contact Info

SSL/TLS Certificate for oncora.cz

Valid
Issued by (CA)
Let's Encrypt
Subject
oncora.cz
Valid from
Jul 16, 2026
Valid until
Oct 14, 2026 (85 days remaining)
Public key
RSA 4096-bit
Serial
05494AFF1AB7F6391C2FC6BD9F8BD8ED5AF1
SHA-256 fingerprint
FE:28:8E:AF:CE:15:30:90:32:F5:CD:C8:76:A2:6A:1B:04:D6:9E:BA:12:43:06:62:80:92:26:89:40:6F:33:DA
Chain
YR2 → Root YR → ISRG Root X1
Subject Alternative Names (2)
oncora.cz, www.oncora.cz

Certificate Authority Authorization (CAA)

The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).