SSL/TLS Certificate Lookup

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

siguestu.cat

SSL/TLS Certificate

Whois RDAP DNS Records Certificate Uptime Diagnostics History Hide Contact Info

SSL/TLS Certificate for siguestu.cat

Expiring soon

Issued by (CA): DigiCert Inc
Subject: siguestu.cat
Valid from: Nov 6, 2025
Valid until: Nov 5, 2026 (16 days remaining)
Public key: RSA 2048-bit
Serial: 057D84C74D88D0C8585B613C9C0FAB7F
SHA-256 fingerprint: AC:35:9F:18:27:AD:1B:FB:38:F3:19:01:C8:24:83:90:7E:BE:C8:69:90:4F:0C:ED:7D:48:36:9E:02:FA:21:7F
Chain: Thawte TLS RSA CA G1 → DigiCert Global Root G2

Subject Alternative Names (2)

siguestu.cat, www.siguestu.cat

Certificate Authority Authorization (CAA)

The serving CA (DigiCert Inc) is not among the authorities this domain's CAA records authorize (thawte.com). This can indicate a misconfiguration or an unexpected issuance.

This certificate has been served since Aug 24, 2026.

Never get surprised by siguestu.cat's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch siguestu.cat 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.