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 12-3.net
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- 12-3.net
- Valid from
- Aug 15, 2026
- Valid until
- Nov 13, 2026 (86 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05F0F7C5358C2472A545DD87D66D49656D23
- SHA-256 fingerprint
- A7:45:CA:11:94:92:13:16:D0:2B:2E:3E:32:28:00:32:C6:34:B4:66:8F:6C:BD:87:08:DB:01:B9:37:BC:50:85
- Chain
- YR1 → Root YR → 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 Jul 29, 2026.
Never get surprised by 12-3.net's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 12-3.net 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.
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