SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
hk-kursus.dk
SSL/TLS Certificate
SSL/TLS Certificate for hk-kursus.dk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.hk-kursus.dk
- Valid from
- Sep 8, 2026
- Valid until
- Dec 7, 2026 (61 days remaining)
- Public key
- EC 256-bit
- Serial
- 05DE541B7158D1045F9632BA249FC47F0C01
- SHA-256 fingerprint
- F9:F7:95:A9:60:CB:FD:A1:4C:3F:05:A1:32:4C:A6:70:9F:50:50:37:94:59:C5:21:DB:6C:75:70:33:58:D9:07
- 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.
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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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