MCP Server For GreyNoise

REQUIRES AN ENTERPRISE API KEY

Installation

MCPB (MCP Bundle)

If you use Claude Desktop or another client that supports MCPB bundles, download greynoise-mcp-server.mcpb from the releases page and double-click to install.

For Production/NPX Usage

npx @greynoise/greynoise-mcp-server --help

Sample entry for Claude Desktop:

{
  "mcpServers": {
    "greynoise": {
      "command": "npx",
      "args": ["@greynoise/greynoise-mcp-server"],
      "env": {
        "GREYNOISE_API_KEY": "your-greynoise-api-key"
      }
    }
  }
}

Or for local development:

{
  "mcpServers": {
    "greynoise": {
      "command": "node",
      "args": ["/absolute/path/to/greynoise-mcp-server/build/index.js"],
      "env": {
        "GREYNOISE_API_KEY": "your-greynoise-api-key"
      }
    }
  }
}

For Development

Clone the repo and then npm install && npm run build.

Build System

This project uses tsup for modern bundling:

• npm run build: Creates optimized bundle for distribution
• npm run build:dev: Development build with source maps
• npm run dev: Watch mode with auto-rebuild

The bundled output includes all core dependencies except Express (for HTTP transport) and dotenv (due to dynamic require limitations).

Transport Options

stdio (Default)

npx @greynoise/greynoise-mcp-server --transport stdio

http

HTTP transport requires Express to be available:

npm install express
node @greynoise/greynoise-mcp-server --transport http

Available Tools

IP Analysis

1. lookup-ip-context - Get detailed context for an IP address including Internet Scanner Intelligence (ISI) and Business Service Intelligence (BSI). Returns classification, tags, scanning activity, HTTP/TLS/SSH fingerprints, geographic info, and more.

2. quick-check-ip - Fast, lightweight check returning just classification and BSI status.

3. multi-ip-check - Check up to 10,000 IP addresses at once. Returns classification, BSI status, and trust level for each IP.

GNQL (GreyNoise Query Language)

1. gnql-query - Search GreyNoise data with GNQL. Returns full IP context results including raw scan data. Supports scroll pagination.

2. gnql-metadata-query - Lightweight GNQL search returning IP metadata without raw scan data. Supports CSV output format.

3. gnql-stats - Get aggregate statistics for GNQL query results (classification breakdown, top organizations, countries, tags, etc).

Recall (Temporal Analysis)

1. gnql-timeseries - Retrieve hourly IP activity records for a time range. Enables temporal analysis of scanning patterns.

2. gnql-timeseries-stats - Get unique IP counts per hour/day over a time range for trend analysis.

Tags

1. get-tag-list - Retrieve the complete list of GreyNoise tags with metadata.

2. search-tags - Search for tags matching a query.

3. get-tag-details - Get comprehensive metadata about a specific tag.

4. get-tag-activity - Get activity data for a tag including trends over time.

5. analyze-tags-activity - Analyze activity patterns across multiple tags.

Vulnerabilities

1. get-trending-vulnerabilities - Get vulnerabilities actively being exploited in the wild.

2. get-cve-details - Get detailed CVE information including GreyNoise exploitation observations.

Sessions (PCAP)

1. get-session - Get full metadata and connection details for a single sensor session by ID.

2. get-session-pcap - Download the raw PCAP capture for a single session. Saves to a temporary file and returns the path.

3. export-sessions-pcap - Export a PCAP file containing packets from multiple sessions matching a time range and optional Lucene query. Saves to a temporary file and returns the path.

Usage Examples

IP Analysis

// Get detailed context for an IP
{ "tool_name": "lookup-ip-context", "parameters": { "ip": "71.6.135.131" } }

// Quick check
{ "tool_name": "quick-check-ip", "parameters": { "ip": "8.8.8.8" } }

// Bulk check
{ "tool_name": "multi-ip-check", "parameters": { "ips": ["8.8.8.8", "1.1.1.1"] } }

GNQL Queries

// Search for malicious IPs seen today
{ "tool_name": "gnql-query", "parameters": { "query": "classification:malicious last_seen:1d", "size": 10 } }

// Lightweight metadata search
{ "tool_name": "gnql-metadata-query", "parameters": { "query": "tags:Mirai", "size": 25 } }

// Get stats for a query
{ "tool_name": "gnql-stats", "parameters": { "query": "classification:malicious", "count": 10 } }

Temporal Analysis (Recall)

// Hourly activity for an IP
{ "tool_name": "gnql-timeseries", "parameters": { "query": "ip:71.6.135.131" } }

// Daily unique IP counts for malicious activity
{ "tool_name": "gnql-timeseries-stats", "parameters": { "query": "classification:malicious", "interval": "day" } }

Sessions

// Get session metadata
{ "tool_name": "get-session", "parameters": { "session_id": "7e98a36cf76f29a020876691892c5f" } }

// Download session PCAP
{ "tool_name": "get-session-pcap", "parameters": { "session_id": "7e98a36cf76f29a020876691892c5f" } }

// Export PCAPs for sessions matching a query
{ "tool_name": "export-sessions-pcap", "parameters": { "start_time": "2026-01-01T00:00:00Z", "end_time": "2026-01-07T23:59:59Z", "query": "destination.port:443", "size": 50 } }

Available Prompts

1. vendor-threat-report - Comprehensive threat report for a vendor technology. Parameters: vendor (required), technology (optional), timeframe 1-90 days (required)

2. ip-threat-analysis - Detailed IP threat analysis with classification, tags, history, and recommendations. Parameters: ip (required), include_related (optional)

3. cve-analysis - CVE analysis including exploitation status and risk assessment. Parameters: cve_id (required), timeframe 1-90 days (optional)

4. emerging-threat-report - Report on emerging threats based on trending activity. Parameters: days (optional: 1/7/30), focus_area (optional)

5. security-posture-assessment - Security posture assessment for an organization's technology stack. Parameters: organization (required), technologies (required), industry (optional)

6. threat-hunting - Threat hunting plan for specific indicators or patterns. Parameters: indicator_type (required: ip/tag/behavior/actor/cve), indicator_value (required), environment (required)

Changelog

See NEWS.md for release notes.