SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
douro-first.pt
SSL/TLS Certificate
SSL/TLS Certificate for douro-first.pt
Valid- Issued by (CA)
- Google Trust Services
- Subject
- douro-first.pt
- Valid from
- Aug 23, 2026
- Valid until
- Nov 21, 2026 (81 days remaining)
- Public key
- EC 256-bit
- Serial
- 993ADCD22789878C0EB90831EB51A2BD
- SHA-256 fingerprint
- E6:A4:9E:E7:AC:25:4F:70:12:FF:EC:6E:1C:BB:8A:A9:58:22:1F:14:4C:BB:53:D8:DD:E0:F9:B2:9C:A0:E1:0A
- Chain
- WE1 → GTS Root R4
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 5, 2026.
Never get surprised by douro-first.pt's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch douro-first.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.