SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
katena.com.pl
SSL/TLS Certificate
SSL/TLS Certificate for katena.com.pl
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- katena.com.pl
- Valid from
- Jul 27, 2026
- Valid until
- Oct 25, 2026 (76 days remaining)
- Public key
- EC 384-bit
- Serial
- 05DE900AEF03F344952C5395B7F17CBB220A
- SHA-256 fingerprint
- 96:BD:64:43:1A:02:C5:09:E3:F5:6F:56:28:DF:D1:F1:67:5D:11:A2:F6:75:72:A3:74:A4:9B:F8:61:43:94:EA
- Chain
- YE1 → 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 Jul 21, 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, 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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