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 3-m.io
Valid- Issued by (CA)
- Google Trust Services
- Subject
- 3-m.io
- Valid from
- Aug 7, 2026
- Valid until
- Nov 5, 2026 (44 days remaining)
- Public key
- EC 256-bit
- Serial
- B44940A8A7AF0256131BB4F147AD9CF4
- SHA-256 fingerprint
- 4A:D6:58:E2:44:D1:AE:3F:5A:66:29:BB:16:C0:5E:CE:F9:B0:2E:95:3A:18:34:10:86:BE:BF:F7:40:11:E2:31
- Chain
- WE1 → GTS Root R4
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 20, 2026.
Never get surprised by 3-m.io's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 3-m.io 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.