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Free Subdomain Intelligence Tool

Find Subdomains of Any Domain

Search a large Certificate Transparency-based hostname index and see subdomains that have been observed, including their first-seen dates when available.

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Host type breakdown

Intelligence summary

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Discovered hostnamesCertificate Transparency observations
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#HostnameTypeFirst seenDNSAction
Important: An indexed hostname means it was observed by the underlying data sources; it does not guarantee that the host is live today. This tool is intended for legitimate domain research, asset inventory, and security awareness. Results are provided by crt.name.