SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
o-telko.de
SSL/TLS Certificate
SSL/TLS Certificate for o-telko.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- o-telko.de
- Valid from
- Oct 8, 2026
- Valid until
- Jan 6, 2027 (80 days remaining)
- Public key
- EC 256-bit
- Serial
- 056075734A89C6B80B3FF98DF65357F6AF3A
- SHA-256 fingerprint
- 2A:55:E0:8D:88:CE:4A:FD:00:D1:F6:68:EE:58:20:CD:FE:EE:9D:95:38:82:5A:E7:3F:78:84:55:52:94:FF:0D
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Oct 17, 2026.
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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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