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 12cn.vip
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- 12cn.vip
- Valid from
- Oct 13, 2026
- Valid until
- Jan 11, 2027 (66 days remaining)
- Public key
- EC 256-bit
- Serial
- 06FE04787FBC248C7E7C94879579429AADAF
- SHA-256 fingerprint
- 53:13:C7:79:CD:24:7D:CC:A8:B8:3F:16:51:BB:04:FF:FE:C1:60:EA:42:51:EB:32:3A:5D:29:43:33:53:26:4A
- 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 Oct 14, 2026.
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Uptime
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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.
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