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 lassejensen.com

Self-signed
Issued by (CA)
webserver3.dk
Subject
webserver3.dk
Valid from
Mar 21, 2024
Valid until
Mar 21, 2025 (expired 535 days ago)
Public key
RSA 4096-bit
Serial
7BD01C2BC4A8874DB55CD05E1A587E54B66F4A62
SHA-256 fingerprint
37:C5:33:44:B1:1E:D3:4D:D5:1C:89:AF:96:4C:5B:4F:2E:FA:63:D3:05:08:04:8E:4B:3E:06:0B:A0:63:82:4A
Chain
webserver3.dk

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 6, 2026.

Never get surprised by lassejensen.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch lassejensen.com 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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.