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 os-toncke-cec.si

Valid
Issued by (CA)
Let's Encrypt
Subject
ostc.splet.arnes.si
Valid from
Sep 15, 2026
Valid until
Dec 14, 2026 (33 days remaining)
Public key
RSA 2048-bit
Serial
0611B12BCD91129E3293056F812906AF0C98
SHA-256 fingerprint
00:D5:68:CC:34:15:08:00:FF:67:84:5D:63:F7:04:68:30:A0:BF:83:32:28:1E:90:D2:25:7A:BB:A1:89:C0:D5
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (3)
os-toncke-cec.si, ostc.splet.arnes.si, www.os-toncke-cec.si

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

Never get surprised by os-toncke-cec.si's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch os-toncke-cec.si continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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.

Monitor this certificate free

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