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 heissner-struck.de

Valid
Issued by (CA)
Sectigo Limited
Subject
www.heissner-struck.de
Valid from
Aug 28, 2025
Valid until
Sep 11, 2026 (35 days remaining)
Public key
RSA 2048-bit
Serial
993295B906E8D29BF3F537E61C515995
SHA-256 fingerprint
BD:59:2D:A4:BA:8F:24:4E:4C:1E:71:BA:8A:0C:A7:6F:B7:B5:21:0D:02:DF:8F:2E:C3:E9:35:16:C4:6D:25:83
Chain
Sectigo Public Server Authentication CA OV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Subject Alternative Names (2)
heissner-struck.de, www.heissner-struck.de

Certificate Authority Authorization (CAA)

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

Never get surprised by heissner-struck.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch heissner-struck.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.