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 otten-architekten.de

Hostname mismatch
Issued by (CA)
Let's Encrypt
Subject
h2360352.stratoserver.net
Valid from
Sep 23, 2026
Valid until
Dec 22, 2026 (45 days remaining)
Public key
RSA 2048-bit
Serial
0519DFB61EC851886F659CB9FB7D96275656
SHA-256 fingerprint
D9:71:BD:F2:C0:60:47:5C:83:F2:75:8A:1D:E8:D4:A9:23:FB:A4:62:09:97:7D:82:B5:DB:F6:BA:BD:39:7E:D3
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (1)
h2360352.stratoserver.net

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 Sep 27, 2026.

Never get surprised by otten-architekten.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch otten-architekten.de continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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, CNAME, TXT 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.