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 konon-ndt.com

Expired
Issued by (CA)
Let's Encrypt
Subject
gdzxksw.com
Valid from
Jun 11, 2026
Valid until
Sep 9, 2026 (expired 59 days ago)
Public key
RSA 2048-bit
Serial
05BA009EAC1ED29597B6E4FA959C77E63044
SHA-256 fingerprint
11:22:06:AA:5D:1A:D2:94:83:DA:8E:FD:3E:FD:8F:08:8D:54:A8:6F:5B:16:3D:94:47:13:DA:6A:56:88:7E:00
Chain
YR2 → Root YR → ISRG Root X1
Subject Alternative Names (6)
gdzxksw.com, konon-ndt.com, m.gdzxksw.com, m.konon-ndt.com, www.gdzxksw.com, www.konon-ndt.com

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 12, 2026.

Never get surprised by konon-ndt.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch konon-ndt.com 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.