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Impacket vs Responder: catalog facts
Impacket	Responder
Free The software is free under its open-source licence. Hosting, hardware and external…	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, macOS, Linux, Command line	Linux, Command line
Its SMB, MSRPC and Kerberos implementations are the foundation most Windows network tooling is built on, with working…	It answers failed name lookups and runs rogue authentication servers for many protocols, which demonstrates the risk of…
It is a library with example scripts rather than a finished product, and the example tools assume you…	It captures real credentials from real users, so it is only ever appropriate inside an authorised engagement.
Downloadable app	Downloadable app
Open source	Open source
License: BSD-2-Clause	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.