# Respounder

Respounder is a Threat Hunting product. It runs on-premises. Pricing is free.

A cross-platform network detection tool that identifies active Responder tools by sending LLMNR queries for fabricated hostnames.

Checked October 2026.

## What is Respounder?

Respounder is a network detection tool that identifies active Responder tools within network environments through LLMNR query analysis.

The tool operates by transmitting LLMNR (Link-Local Multicast Name Resolution) name resolution requests for non-existent hostnames across the network infrastructure. This methodology forces any deployed Responder instances to reveal their presence by responding to these fabricated queries.

The application supports cross-platform deployment across 32-bit and 64-bit Linux distributions, OS X, and Windows operating systems. It can be implemented using pre-compiled binaries or compiled from source code using Golang without requiring additional dependencies.

Respounder serves as a defensive security mechanism that enables network administrators and security professionals to detect potentially malicious Responder tools that could be utilized for credential harvesting or man-in-the-middle attack scenarios within their network perimeter.

Tags: Network Monitoring

## Where it fits in your security program (NIST CSF 2.0)

- [Detect](https://cybersectools.com/guides/building-detect-program-small-team): helps you spot attacks and unusual activity.

## Quick facts

- Category: [Security Operations](https://cybersectools.com/categories/security-operations) · [Threat Hunting](https://cybersectools.com/categories/threat-hunting)
- Deployment: On-Premises
- Company size fit: SMB, Mid-Market, Enterprise
- Pricing model: Free
- GitHub stars: 322
- Website: github.com

## Where it ranks

No shortlist covers this product's category yet. The closest is [Best MDR Solutions for Business](https://cybersectools.com/shortlists/best-mdr-solutions).

## Respounder FAQ

### What is Respounder?

Respounder is a product in the Threat Hunting category. It covers Network Monitoring.

### What is the pricing for Respounder?

Respounder is free. Download and setup instructions are at https://github.com/codeexpress/respounder/.

### What are alternatives to Respounder?

Alternatives to Respounder listed on CybersecTools:

1. [Managed Agentic Threat Hunting](https://cybersectools.com/tools/managed-agentic-threat-hunting) - Managed Agentic Threat Hunting Service (IOC sweeps and hypothesis based hunting) (Commercial)
2. [Akamai Hunt](https://cybersectools.com/tools/akamai-hunt) - Managed threat hunting service detecting evasive threats in network environments (Commercial)
3. [Elastic Search AI Platform](https://cybersectools.com/tools/elastic-search-ai-platform) - Search AI platform with vector database for logs, threat hunting, and AI apps (Commercial)
4. [Cybereason Threat Hunting](https://cybersectools.com/tools/cybereason-threat-hunting) - Proactive threat hunting platform for detecting and investigating attacks (Commercial)
5. [Censys Threat Hunting](https://cybersectools.com/tools/censys-threat-hunting) - Proactive threat hunting platform for detecting adversary infrastructure (Commercial)

Compare all Respounder alternatives at [https://cybersectools.com/alternatives/respounder](https://cybersectools.com/alternatives/respounder)

### What deployment and organization size does Respounder fit?

Respounder is available as on-premises software. It is listed for small businesses, mid-market companies and enterprises. It is free.

## Compare Respounder with similar solutions

- [Respounder vs Managed Agentic Threat Hunting](https://cybersectools.com/compare/managed-agentic-threat-hunting-vs-respounder)
- [Respounder vs Akamai Hunt](https://cybersectools.com/compare/akamai-hunt-vs-respounder)
- [Respounder vs Elastic Search AI Platform](https://cybersectools.com/compare/elastic-search-ai-platform-vs-respounder)

All alternatives to Respounder: [/alternatives/respounder](https://cybersectools.com/alternatives/respounder)

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Source: https://cybersectools.com/tools/respounder

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More on Respounder: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=product-md