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 sk-st.dk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sk-st.dk
- Valid from
- Oct 5, 2026
- Valid until
- Jan 3, 2027 (58 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06918760A0892434C30FAEF1CBF22139725E
- SHA-256 fingerprint
- B6:99:27:83:E9:68:D7:2C:06:12:8C:E5:B7:11:03:29:A9:54:E8:3C:FE:54:00:E7:1F:8B:59:0D:7F:D1:16:7B
- 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 10, 2026.
Never get surprised by sk-st.dk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sk-st.dk continuously, notifying you the moment anything moves across all three signals:
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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