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 js-ptuj.si

Valid
Issued by (CA)
Let's Encrypt
Subject
js-ptuj.si
Valid from
Aug 21, 2026
Valid until
Nov 19, 2026 (71 days remaining)
Public key
RSA 4096-bit
Serial
05ADC506E29567C0947F8CE6D36C058E49B3
SHA-256 fingerprint
59:C8:65:5F:1E:11:B9:E8:0E:1E:F6:D9:62:20:51:13:2F:78:5E:51:AE:BA:3C:2A:88:A9:7E:22:C3:D5:4E:14
Chain
YR2 → Root YR → ISRG Root X1
Subject Alternative Names (3)
js-ptuj.si, mail.js-ptuj.si, www.js-ptuj.si

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 Aug 22, 2026.

Never get surprised by js-ptuj.si's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch js-ptuj.si 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.