SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
stephan-pfeifhofer.com
SSL/TLS Certificate
SSL/TLS Certificate for stephan-pfeifhofer.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- stephan-pfeifhofer.com
- Valid from
- Oct 13, 2026
- Valid until
- Jan 11, 2027 (85 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 06567E6E955AD93A57484C2B2EC5EF505501
- SHA-256 fingerprint
- 3E:74:82:F1:1B:9C:6C:EE:B1:81:B9:89:AF:18:7E:8E:FE:C7:A8:04:75:EF:4E:BF:9A:A5:F6:D5:07:D1:C0:71
- 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).
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Uptime
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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.
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