responder

LLMNR/NBT-NS/mDNS Poisoner

Matches ATT&CK tactic: Credential Access ↗

Platforms: Linux · Last verified September 6, 2026

This package contains Responder/MultiRelay, an LLMNR, NBT-NS and MDNS poisoner. It will answer to specific NBT-NS (NetBIOS Name Service) queries based on their name suffix (see: http://support.microsoft.com/kb/163409). By default, the tool will only answer to File Server Service request, which is for SMB.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

See the official Kali tool page and upstream homepage linked above for installation and usage details.

Commonly preinstalled on

Kali Linux

Debian-based distribution built for penetration testing and security auditing