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 ksimmo.at

Self-signed
Issued by (CA)
c3.aboliton.at
Subject
c3.aboliton.at
Valid from
Sep 25, 2026
Valid until
Sep 25, 2027 (357 days remaining)
Public key
RSA 4096-bit
Serial
5E8DE7C70F95B7E1A5AD0CFE5F9BE39BD3B04996
SHA-256 fingerprint
06:06:3B:2D:A0:B0:47:A9:11:2C:83:D9:4D:B7:00:3B:12:5F:19:D7:BE:8D:1C:20:6A:52:C1:A0:38:57:F7:1F
Chain
c3.aboliton.at

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 30, 2026.

Never get surprised by ksimmo.at's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ksimmo.at 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.