SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
jan-bubenicek.cz
SSL/TLS Certificate
SSL/TLS Certificate for jan-bubenicek.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- jan-bubenicek.cz
- Valid from
- Sep 4, 2026
- Valid until
- Dec 3, 2026 (41 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 06BDED9A2F458A05BED8EC25918D9543C3DD
- SHA-256 fingerprint
- 24:55:B2:25:53:88:AD:0A:75:F8:84:56:D0:ED:14:32:4B:61:87:10:AB:65:12:F6:DA:35:E9:10:95:70:47:59
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Oct 5, 2026.
Never get surprised by jan-bubenicek.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch jan-bubenicek.cz continuously, notifying you the moment anything moves across all three signals:

Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
Free for your first domain: uptime, DNS, and certificate together. No credit card.