xsubfind3r

Command-line utility that discovers a domain's subdomains from passive public sources

Desktopfree

xsubfind3r is an open-source command-line tool that lists the subdomains of a given domain using publicly available data, without sending traffic to the target itself. It reads and writes through standard input and output so it can be chained into automated workflows, and runs on Windows, Linux and macOS. It is used by security researchers and IT staff mapping the hosts attached to a domain.

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