SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
staff-association.cern
SSL/TLS Certificate
SSL/TLS Certificate for staff-association.cern
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- www.cern.ch
- Valid from
- Nov 5, 2025
- Valid until
- Nov 24, 2026 (121 days remaining)
- Public key
- RSA 2048-bit
- Serial
- B9E18CEA78FC41C2E7FBDD1CAD5638F1
- SHA-256 fingerprint
- 17:0D:6B:78:94:64:BC:C4:3F:F6:0F:D0:0C:82:5B:26:15:2E:11:60:97:69:F2:77:9C:B1:6B:33:9E:CF:5C:90
- Chain
- Sectigo Public Server Authentication CA OV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by staff-association.cern's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch staff-association.cern 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.