SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
alu-as.cz
SSL/TLS Certificate
SSL/TLS Certificate for alu-as.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- alu-as.cz
- Valid from
- Sep 22, 2026
- Valid until
- Dec 21, 2026 (76 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 067D5B9BA656722EEFDCD3FC0AAFD09DF132
- SHA-256 fingerprint
- 2F:D5:64:DF:7C:41:71:BC:EB:81:B5:F2:2B:80:D8:16:A5:27:29:05:F5:7D:6D:74:BD:E2:5A:20:7F:60:0A:74
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 25, 2026.
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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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