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 lucis.at
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.greenplanet.at
- Valid from
- Jul 12, 2026
- Valid until
- Oct 10, 2026 (75 days remaining)
- Public key
- EC 256-bit
- Serial
- 058E15348B219126CB007A6ACA91E553A7AB
- SHA-256 fingerprint
- 92:CE:19:09:C5:D4:E2:0C:AC:E9:B9:4A:77:70:68:AE:F9:39:E6:5E:4B:02:A3:67:35:FA:CE:E4:21:31:53:BE
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org, pki.goog).
Never get surprised by lucis.at's certificate expiring
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Uptime
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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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