SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sfs-sonderborg.dk
SSL/TLS Certificate
SSL/TLS Certificate for sfs-sonderborg.dk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.sfs-sonderborg.dk
- Valid from
- Jul 25, 2026
- Valid until
- Oct 23, 2026 (70 days remaining)
- Public key
- RSA 3072-bit
- Serial
- 069EF176395C7CEF46E2202F4E6C336FE807
- SHA-256 fingerprint
- 9B:A0:B0:82:DF:24:75:AC:4D:BA:8A:92:D2:D3:2D:E0:EA:6C:4A:37:0B:98:1C:08:AD:28:E7:CF:73:D0:C5:54
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by sfs-sonderborg.dk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sfs-sonderborg.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, 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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