SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
janbrunclik.cz
SSL/TLS Certificate
SSL/TLS Certificate for janbrunclik.cz
Self-signed- Issued by (CA)
- web
- Subject
- web
- Valid from
- Sep 22, 2025
- Valid until
- Sep 20, 2035 (3346 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 5489C79F5CC11291A0BA84233852E58468A7DAC8
- SHA-256 fingerprint
- 4B:82:2C:B9:EA:5C:CC:63:B6:3B:B1:34:51:96:32:34:14:D9:25:3B:74:B1:DD:C1:7C:86:F1:1B:52:FF:F1:0F
- Chain
- web
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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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