SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
steffen-o.dk
SSL/TLS Certificate
SSL/TLS Certificate for steffen-o.dk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- steffen-o.dk
- Valid from
- Aug 17, 2026
- Valid until
- Nov 15, 2026 (72 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 067BD1ED93D181E63283F5099A11F2194C90
- SHA-256 fingerprint
- BF:17:55:AE:EF:31:52:97:7E:A6:43:12:76:C7:75:68:9E:95:55:BA:3D:5C:09:9D:F8:2F:D6:C0:5A:09:9C:B3
- 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.
This certificate has been served since Aug 29, 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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