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 owain-glyndwr.org.uk

Hostname mismatch
Issued by (CA)
Let's Encrypt
Subject
ukc13.uk
Valid from
Sep 20, 2026
Valid until
Dec 19, 2026 (41 days remaining)
Public key
RSA 2048-bit
Serial
06D48A535E1587939BC9B6573B4DA1003185
SHA-256 fingerprint
7B:0D:A8:20:83:04:7D:F2:3C:39:D8:3D:C2:DB:55:D1:35:94:F0:8D:F6:2B:80:72:04:4E:4D:91:1C:ED:49:66
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (2)
*.ukc13.uk, ukc13.uk

Certificate Authority Authorization (CAA)

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

We've observed 1 previous certificate for this host. This certificate has been served since Sep 30, 2026.

Never get surprised by owain-glyndwr.org.uk's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch owain-glyndwr.org.uk 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.