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 fys-a.dk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- fys-a.dk
- Valid from
- Aug 26, 2026
- Valid until
- Nov 24, 2026 (82 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05D9D4597511E470E1A56A428299B34ED97F
- SHA-256 fingerprint
- B6:EA:E9:FC:D9:6D:0B:07:0D:AC:EA:38:0F:4B:08:46:9E:7C:1C:FF:3D:09:CC:21:5E:12:96:B2:04:F8:7F:5E
- 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 Aug 15, 2026.
Never get surprised by fys-a.dk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch fys-a.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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