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 gegenbauer.de

Expired
Issued by (CA)
Let's Encrypt
Subject
www.gegenbauer.de
Valid from
Feb 10, 2024
Valid until
May 10, 2024 (expired 836 days ago)
Public key
RSA 2048-bit
Serial
03CBD085BD87AD27CF1EBE96ACE1D060F6DC
SHA-256 fingerprint
57:44:FB:A8:55:B6:C9:4E:9B:6B:37:A8:CE:0B:3B:4B:27:6A:A9:96:9D:C2:EA:CF:10:0D:3F:95:B7:D3:2E:69
Chain
R3 → ISRG Root X1
Subject Alternative Names (1)
www.gegenbauer.de

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 Aug 23, 2026.

Never get surprised by gegenbauer.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch gegenbauer.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.