SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
semaforo-iot.com
SSL/TLS Certificate
SSL/TLS Certificate for semaforo-iot.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- semaforo-iot.com
- Valid from
- Sep 29, 2026
- Valid until
- Dec 28, 2026 (45 days remaining)
- Public key
- EC 256-bit
- Serial
- 069FCAA434765E8E78968BC0B85EAB7D331E
- SHA-256 fingerprint
- A6:37:DC:2A:F4:E4:E9:A2:A5:91:95:FE:0F:C6:A4:1B:22:50:B5:83:95:2E:D8:E0:E8:3A:8B:A5:18:73:45:CF
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
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 Oct 6, 2026.
Never get surprised by semaforo-iot.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch semaforo-iot.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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.