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 per-a.dk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.per-a.dk
- Valid from
- Aug 27, 2026
- Valid until
- Nov 25, 2026 (59 days remaining)
- Public key
- EC 256-bit
- Serial
- 06B803DBFA5FD9A740A65346A2639B65B7C0
- SHA-256 fingerprint
- 5D:DA:77:20:1A:85:60:26:F8:3B:3F:7E:48:B4:27:26:06:49:81:1A:B7:29:E9:AF:E1:F0:88:83:D8:E0:8C:58
- Chain
- YE2 → Root YE → ISRG Root X2 → 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 20, 2026.
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This is today's certificate. Turn on monitoring and we'll watch per-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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