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 sitmp.cz
Untrusted chain- Issued by (CA)
- Let's Encrypt
- Subject
- *.sitmp.cz
- Valid from
- Sep 10, 2026
- Valid until
- Dec 9, 2026 (75 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 065AE10B4FE429FA67667E3EA371B6BA3D94
- SHA-256 fingerprint
- 94:3A:1A:A0:C8:6D:14:30:D5:CF:B0:5C:38:F5:44:83:FB:39:4B:D3:C3:6F:A7:4E:4F:6F:9E:62:BC:80:25:F8
- Chain
- —
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 Sep 6, 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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