SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
dr-theiss.de
SSL/TLS Certificate
SSL/TLS Certificate for dr-theiss.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- dr-theiss.de
- Valid from
- Oct 12, 2026
- Valid until
- Jan 10, 2027 (64 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 056D8B4A8A6D984863769EA90779D2B71D2B
- SHA-256 fingerprint
- 2A:00:2F:5F:62:21:E1:BF:B3:47:A2:14:D2:A2:C9:F2:99:05:09:5B:5D:33:A0:C5:40:A4:97:78:73:B1:37:EE
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by dr-theiss.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch dr-theiss.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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.