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 zo-on.is
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- zo-on.is
- Valid from
- Aug 6, 2026
- Valid until
- Nov 4, 2026 (59 days remaining)
- Public key
- EC 256-bit
- Serial
- 068C3ADC13C6E899FDB0A89BC9D294F61B60
- SHA-256 fingerprint
- 37:C6:3E:5D:30:6B:B0:5B:E6:9F:64:DE:40:AE:DD:1F:B5:38:F2:66:62:33:92:AA:5A:86:13:B7:90:A6:7F:82
- Chain
- YE1 → 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 Aug 19, 2026.
Never get surprised by zo-on.is's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch zo-on.is 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.