SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
thorsten-schaefer.com
SSL/TLS Certificate
SSL/TLS Certificate for thorsten-schaefer.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- thorsten-schaefer.com
- Valid from
- Jul 30, 2026
- Valid until
- Oct 28, 2026 (47 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 05AAED0B871C08FF9646BF077D392CA272FD
- SHA-256 fingerprint
- 74:30:6F:07:EC:3B:CB:F1:24:31:B1:4B:59:E6:F9:01:7B:8E:CF:82:53:FB:D7:74:6D:EC:46:09:3A:E9:00:B2
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
Never get surprised by thorsten-schaefer.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch thorsten-schaefer.com 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.
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