SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

thispagedoesnotexist12345.tech

SSL/TLS Certificate

SSL/TLS Certificate for thispagedoesnotexist12345.tech

Valid
Issued by (CA)
Let's Encrypt
Subject
thispagedoesnotexist12345.tech
Valid from
Jun 9, 2026
Valid until
Sep 7, 2026 (42 days remaining)
Public key
EC 256-bit
Serial
05FE9A74A197F3D58EE7D531B6F03341E491
SHA-256 fingerprint
FE:28:89:28:C5:17:7A:33:3B:F9:DF:C5:4E:9B:59:1C:9A:38:03:86:07:2C:63:76:1E:1E:B9:3A:08:E4:C2:1D
Chain
YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Subject Alternative Names (2)
*.thispagedoesnotexist12345.tech, thispagedoesnotexist12345.tech

Certificate Authority Authorization (CAA)

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

Never get surprised by thispagedoesnotexist12345.tech's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch thispagedoesnotexist12345.tech 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.