Does it check internal/private domains?

Only publicly accessible domains. Internal CAs need a different approach.

How accurate is the expiry date?

Exact — it reads the NotAfter field from the live certificate.

One at a time currently. Batch mode is planned.

It shows the issuer. Full chain validation requires a more specialized tool.

The domain name goes to a public SSL-checking API. No sensitive data is involved.

Yes — the issuer field will show it is self-signed.

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检查 SSL 证书状态和到期时间

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检查 SSL 证书状态和到期时间

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