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 d-na.ch
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- d-na.ch
- Valid from
- Sep 28, 2026
- Valid until
- Dec 27, 2026 (67 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0688CBCD04979820E3ACB382C757B47CC964
- SHA-256 fingerprint
- 3F:4F:56:FD:13:A1:67:A8:3D:8E:A3:52:C5:C3:92:9F:CC:B3:66:3E:57:5C:36:75:93:E9:A6:8B:B3:1E:54:48
- 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 8, 2026.
Never get surprised by d-na.ch's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch d-na.ch 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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