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 cm-viana-castelo.pt

Valid
Issued by (CA)
Sectigo Limited
Subject
*.cm-viana-castelo.pt
Valid from
Aug 5, 2025
Valid until
Aug 14, 2026 (22 days remaining)
Public key
RSA 2048-bit
Serial
799F9CCC89696E86F7701864A848AEEA
SHA-256 fingerprint
94:22:81:CB:43:31:CB:B5:0C:AA:8D:77:CC:0D:C3:81:25:EA:52:A9:8E:1D:87:16:6F:4E:3B:21:91:6A:77:79
Chain
Sectigo Public Server Authentication CA DV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Subject Alternative Names (2)
*.cm-viana-castelo.pt, cm-viana-castelo.pt

Certificate Authority Authorization (CAA)

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

Never get surprised by cm-viana-castelo.pt's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch cm-viana-castelo.pt 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.