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 mar-k.dk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.mar-k.dk
- Valid from
- Sep 24, 2026
- Valid until
- Dec 23, 2026 (87 days remaining)
- Public key
- EC 256-bit
- Serial
- 05BA7F95027DEB49B911800DE0E4221D788B
- SHA-256 fingerprint
- 3B:95:3B:83:31:E6:44:B8:94:21:0F:29:CC:D4:17:3C:15:D7:12:12:8E:1F:0A:8C:AA:FB:43:67:B5:FC:70:9D
- Chain
- YE1 → 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.
Never get surprised by mar-k.dk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch mar-k.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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