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 stadtbibliothek-chemnitz.de

Hostname mismatch
Issued by (CA)
Hellenic Academic and Research Institutions CA
Subject
www.stadtbibliothek-chemnitz.de
Valid from
Nov 18, 2025
Valid until
Nov 18, 2026 (93 days remaining)
Public key
RSA 2048-bit
Serial
36EEBD3106118F34840518CDE342A76F
SHA-256 fingerprint
DE:81:2D:48:9C:A2:67:BA:B8:99:D7:F2:03:6C:F8:84:85:4C:06:B8:12:6C:16:A4:D0:35:5A:35:E4:D8:3D:AF
Chain
GEANT TLS RSA 1 → HARICA TLS RSA Root CA 2021 → Hellenic Academic and Research Institutions RootCA 2015
Subject Alternative Names (1)
www.stadtbibliothek-chemnitz.de

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

Never get surprised by stadtbibliothek-chemnitz.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch stadtbibliothek-chemnitz.de 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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.