Greynoise

Name: Greynoise
Author: nickjlucker

by nickjluckerversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.nickjlucker/greynoise

Install

Overview

Description from the maker (original English)

MCP server for GreyNoise API - Check if IPs are internet background noise or targeted attacks

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: GREYNOISE_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: GREYNOISE_API_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "greynoise": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-greynoise"
      ],
      "env": {
        "GREYNOISE_API_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add greynoise --env GREYNOISE_API_KEY=your-value -- npx -y mcp-greynoise

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "greynoise": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-greynoise"
      ],
      "env": {
        "GREYNOISE_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "greynoise": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-greynoise"
      ],
      "env": {
        "GREYNOISE_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

GREYNOISE_API_KEY secret required env
GreyNoise API key (free Community tier: 50 req/day)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account nickjlucker, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32583 servers in this category
Published to the registry more recently than 3% of the other 32583 servers in this category
Basic checks equal to or better than 100% of the other 32583 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Greynoise safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: GREYNOISE_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 8 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, sync. labs

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computer★ 440MITUpdated 14 months ago

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Runs in the cloud★ 211Updated yesterday

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Computer or cloudUpdated today

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

mcp-greynoise

MCP server for the GreyNoise API — check if IP addresses are internet background noise or potentially targeted attacks.

Quick Start

npx mcp-greynoise

That's it. Works out of the box with 10 lookups/day (no API key needed).

What is GreyNoise?

GreyNoise collects and analyzes internet-wide scan traffic. It tells you:

Noise: Is this IP mass-scanning the internet? (botnets, researchers, crawlers)
RIOT: Is this IP a known benign service? (Google, Cloudflare, Microsoft, etc.)
Classification: Malicious, benign, or unknown

Why this matters for security

When you see suspicious traffic in your logs:

GreyNoise Result	Interpretation
NOISE + Malicious	Background attack traffic (scanners, botnets) — likely untargeted
NOISE + Benign	Security researchers, search crawlers — usually safe
RIOT	Known good service (CDN, DNS, cloud) — almost certainly benign
NOT NOISE	⚠️ This IP is NOT mass-scanning — traffic may be targeted at you

The "NOT NOISE" case is often the most important — it suggests someone is specifically interested in your systems.

Demo

Example output from `check_ip`:

IP: 51.91.185.74

Classification: MALICIOUS Noise: YES - This IP has been observed scanning the internet RIOT: NO - Not a known benign service IP Last Seen: 2024-01-15 Details: https://viz.greynoise.io/ip/51.91.185.74

--- Interpretation --- 🚨 This IP is actively scanning the internet and classified as MALICIOUS. Likely a scanner, botnet, or threat actor.

Installation

npm (recommended)

npm install -g mcp-greynoise

npx (no install)

npx mcp-greynoise

From source

git clone https://github.com/nickjlucker/mcp-greynoise.git

cd mcp-greynoise npm install npm run build node build/index.js

Configuration

Claude Desktop

Add to your claude_desktop_config.json:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

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

Environment Variables

Variable	Required	Description
`GREYNOISE_API_KEY`	No	API key for higher rate limits (50/day vs 10/day)

Get a free API key at viz.greynoise.io/signup.

⚠️ Never commit API keys. See .env.example for the recommended setup.

Tools

`check_ip`

Check a single IP address against GreyNoise.

Input:

ip (string): IPv4 address to check

`check_ips`

Check multiple IP addresses in one call (max 10).

Input:

ips (string[]): Array of IPv4 addresses

Example output:

=== Results ===

8.8.8.8: RIOT (benign service) [Google] 51.91.185.74: NOISE - MALICIOUS 192.168.1.1: NOT NOISE (potentially targeted)

--- Legend --- RIOT: Known benign service (CDN, DNS, etc.) NOISE: IP is mass-scanning the internet NOT NOISE: IP is NOT mass-scanning (traffic may be targeted)

Resources

`greynoise://status`

Returns API status and rate limit information.

Rate Limits

Tier	Daily Lookups
Unauthenticated	10
Free account	50
Paid plans	Higher

Rate limits are shared between API calls and the GreyNoise Visualizer.

Security

This server:

Only reads from the GreyNoise API (no scanning, no exploitation)
Does not store any data beyond the current request
Does not transmit your API key anywhere except to GreyNoise
Performs reputation/telemetry enrichment only

Your API key is passed via environment variable and never logged.

Use Cases

SOC Triage: Quickly determine if alert IPs are background noise or targeted
Incident Response: Identify if attacker IPs are mass-scanners or focused threats
Threat Hunting: Find IPs in your logs that aren't mass-scanners (potentially targeted)
Log Analysis: Reduce false positives by filtering out known scanners

Development

# Install dependencies

npm install

Run in development mode

npm run dev

Build for production

npm run build

Run built version

npm start

License

MIT

Greynoise

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

sync. labs

README from the maker

mcp-greynoise

Quick Start

What is GreyNoise?

Why this matters for security

Demo

Installation

npm (recommended)

npx (no install)

From source

Configuration

Claude Desktop

Environment Variables

Tools

check_ip

check_ips

Resources

greynoise://status

Rate Limits

Security

Use Cases

Development

Run in development mode

Build for production

Run built version

License

Links

`check_ip`

`check_ips`

`greynoise://status`