SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for bz-uk.cz
Valid- Issued by (CA)
- Hellenic Academic and Research Institutions CA
- Subject
- web.natur.cuni.cz
- Valid from
- Sep 17, 2025
- Valid until
- Sep 17, 2026 (55 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 72980ED5165E64022844EA8F7BDF9A26
- SHA-256 fingerprint
- B3:2D:5B:C1:36:71:7A:BA:EC:3A:0C:B0:ED:09:AB:3D:7D:51:27:80:F9:52:C4:E3:68:08:6D:C4:3B:E2:0A:F1
- Chain
- GEANT TLS RSA 1 → HARICA TLS RSA Root CA 2021 → Hellenic Academic and Research Institutions RootCA 2015
Certificate Authority Authorization (CAA)
CAA restricts issuance to harica.gr; we couldn't map the serving CA (Hellenic Academic and Research Institutions CA) to one of these identifiers.
Never get surprised by bz-uk.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch bz-uk.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, DNSSEC, CNAME 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.