SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
kai-schaefer.com
SSL/TLS Certificate
SSL/TLS Certificate for kai-schaefer.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.markuszipfel.de
- Valid from
- Aug 5, 2026
- Valid until
- Nov 3, 2026 (70 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0609E34599F25E2B2B30C60D69FF9B19EEFF
- SHA-256 fingerprint
- A0:4C:6C:3D:D7:94:AE:D4:E8:E7:63:80:21:94:B8:DF:41:A2:DB:05:65:EC:4C:D1:BA:B4:F9:24:60:6B:B8:A2
- 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.
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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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