SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ak-sigmundova.cz
SSL/TLS Certificate
SSL/TLS Certificate for ak-sigmundova.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.ak-sigmundova.cz
- Valid from
- Oct 2, 2026
- Valid until
- Dec 31, 2026 (71 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 062F1EFC4C6127C540E014A8E9773E804881
- SHA-256 fingerprint
- 98:65:F0:29:05:B3:99:04:97:33:9B:CA:6C:9A:08:4D:99:0B:7C:D5:B2:4D:E6:C9:82:66:8D:6F:A2:16:99:18
- Chain
- YR1 → 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 8, 2026.
Never get surprised by ak-sigmundova.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ak-sigmundova.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.