SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
astra-g.cz
SSL/TLS Certificate
SSL/TLS Certificate for astra-g.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.astra-g.cz
- Valid from
- Oct 5, 2026
- Valid until
- Jan 3, 2027 (56 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 063AFF2964891C438AF3D1AF1EDE799F707D
- SHA-256 fingerprint
- E6:EC:D6:01:3D:AF:4F:87:8C:AB:68:03:1F:39:B3:BB:A9:C6:6B:B7:75:0B:F1:F8:E3:3E:76:E1:16:D6:24:A0
- 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.
This certificate has been served since Sep 23, 2026.
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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, 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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