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 vermessung-dortmund.de

Valid
Issued by (CA)
Sectigo Limited
Subject
*.vermessung-dortmund.de
Valid from
Oct 11, 2025
Valid until
Oct 25, 2026 (68 days remaining)
Public key
RSA 2048-bit
Serial
B9743C638938B7F4B922531A6AB6F5D2
SHA-256 fingerprint
45:D5:1E:62:D2:03:2A:BB:B2:75:3A:6F:38:D3:D1:75:3F:F2:37:0F:9D:85:EE:1E:13:4B:AB:8B:AF:3D:18:61
Chain
Sectigo Public Server Authentication CA DV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Subject Alternative Names (2)
*.vermessung-dortmund.de, vermessung-dortmund.de

Certificate Authority Authorization (CAA)

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

Never get surprised by vermessung-dortmund.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch vermessung-dortmund.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.