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 sem-track.com

Untrusted chain
Issued by (CA)
Sectigo Limited
Subject
Valid from
Jun 10, 2026
Valid until
Dec 25, 2026 (133 days remaining)
Public key
RSA 2048-bit
Serial
2E2D97B735D3B9C4601FC3526918D045
SHA-256 fingerprint
4C:FF:07:81:99:8A:1B:D2:E0:E1:56:54:77:1E:BD:80:50:B0:2B:2F:B0:2A:11:9D:97:35:FC:87:CF:B7:1D:56
Chain
Subject Alternative Names (13)
*.admin.sem-track.com, *.api.sem-track.com, *.dev.sem-track.com, *.irc.sem-track.com, *.mail.sem-track.com, *.portal.sem-track.com, *.sbx.sem-track.com, *.sem-track.com, *.sys.sem-track.com, *.training.sem-track.com, *.vendor.sem-track.com, *.ws.sem-track.com, sem-track.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 sem-track.com's certificate expiring

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