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Query Domain and IP Registration Data

Whois MCP lets AI agents like Claude Desktop and Cursor perform WHOIS lookups on domains, TLDs, IPs, and ASNs directly.

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Bharathvaj
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91
Spark score
out of 100
Updated Mar 2025
Fresher alternatives ↓
Source checked Sep 10, 2026
Version 1.0.0
Models
universal
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Why it matters

Leverage AI agents to perform comprehensive WHOIS queries for domains, IP addresses, ASNs, and TLDs. Retrieve essential registration information, ownership details, and other critical domain-related data.

Outcomes

What it gets done

01

Check domain availability and ownership.

02

Retrieve domain registration, expiration, and nameserver details.

03

Query WHOIS information for IP addresses and ASNs.

04

Look up details for top-level domains (TLDs).

Install

Add it to your toolbox

Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/vb-whois-mcp | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

Reports

Agent outcome reports

No reports yet

Capabilities

Tools your agent gets

whois_domain

Look up WHOIS information for a domain including ownership, registration dates, and status

whois_tld

Look up WHOIS information for a top-level domain (TLD)

whois_ip

Look up WHOIS information for an IP address

whois_as

Look up WHOIS information for an Autonomous System Number (ASN)

Overview

Whois MCP Server

Whois MCP exposes four tools - whois_domain, whois_tld, whois_ip, and whois_as - that let AI agents like Cursor and Claude Desktop retrieve WHOIS registration details directly in a conversation. Use it whenever an assistant needs to check domain availability, ownership, or registration details for a domain, TLD, IP, or ASN.

What it does

Whois MCP lets AI agents such as Claude Desktop, Cursor, and Windsurf perform WHOIS lookups and retrieve domain registration details without the user leaving the conversation to search a separate WHOIS website. A WHOIS lookup queries a WHOIS database for registration details about a domain name, IP address, or autonomous system, surfacing information such as the domain name queried, the registrar managing it, registrant details (unless hidden by WHOIS privacy), registration and expiry dates, name servers, domain status (active, expired, locked, or pending deletion), and administrative, technical, and billing contact information where not hidden.

When to use - and when NOT to

Use this whenever an assistant needs to check domain availability, ownership, or registration details, an IP address's ownership, a TLD's registry information, or an ASN's ownership details, directly as part of answering a question or automating a task. It is scoped to WHOIS data specifically - it does not perform DNS resolution beyond what WHOIS returns, and any registrant detail hidden by WHOIS privacy protection will simply not be available through the lookup either.

Inputs and outputs

Four tools are exposed: whois_domain for domain lookups, whois_tld for top-level-domain lookups, whois_ip for IP address lookups, and whois_as for autonomous system number lookups.

Integrations

Installed globally via npx -y @bharathvaj/whois-mcp@latest, or project-specifically by adding a .cursor/mcp.json (or equivalent) file with the same npx command as the server entry. Works with Cursor (via Cursor Settings > MCP or a project-level config file) and Roo Code (via its MCP Settings panel or the "Roo Code: Open MCP Config" command in VS Code), with the tools becoming automatically available to those agents once configured. Development uses pnpm install and pnpm build, and debugging is done through the MCP Inspector against the built dist/index.js. The project is released under the MIT License.

Who it's for

Developers and anyone using an AI agent like Cursor or Claude Desktop who wants domain, TLD, IP, or ASN ownership and registration details surfaced directly in a conversation instead of a manual WHOIS search.

The project frames the core value proposition directly: rather than opening a browser and searching a WHOIS site by hand, a user can simply ask the agent whether a domain is available, who owns it, when it was registered, and when it expires, and get an answer inline as part of whatever task prompted the question in the first place.

npx -y @bharathvaj/whois-mcp@latest
Source README

Whois MCP

Model Context Protocol server for whois lookups.

Whois MCP server

Cursor IDE Demo

https://github.com/user-attachments/assets/57a82adc-3f30-453f-aabd-7138c2e6a21d

Claude Desktop Demo

https://github.com/user-attachments/assets/d30a1f45-fdaf-4280-80f2-d5d4fc9743b1

Overview

This MCP server allows AI agents like Claude Desktop, Cursor, Windsurf,.. etc to perform WHOIS lookups and retrieve domain details.

Purpose
You can directly ask the AI to check if a domain is available, who owns it, when it was registered, and other important details. No need to go to browser and search.

What is a WHOIS Lookup?
A WHOIS lookup is the process of querying a WHOIS database to retrieve registration details about a domain name, IP address, or autonomous system. It helps users find out who owns a domain, when it was registered, when it expires, and other important details.

What Information Can a WHOIS Lookup Provide?

When you perform a WHOIS lookup, you can retrieve details such as:

  • Domain Name - The specific domain queried
  • Registrar Name - The company managing the domain registration (e.g., GoDaddy, Namecheap)
  • Registrant Details - The name, organization, and contact details of the domain owner (unless protected by WHOIS privacy)
  • Registration & Expiry Date - When the domain was registered and when it will expire
  • Name Servers - The DNS servers the domain is using
  • Domain Status - Active, expired, locked, or pending deletion
  • Contact Information - Administrative, technical, and billing contacts (if not hidden)

Available Tools

Tool Description
whois_domain Looksup whois information about the domain
whois_tld Looksup whois information about the Top Level Domain (TLD)
whois_ip Looksup whois information about the IP
whois_as Looksup whois information about the Autonomous System Number (ASN)

Using with Cursor

Installation - Globally

Run the MCP server using npx:

npx -y @bharathvaj/whois-mcp@latest

In your Cursor IDE

  1. Go to Cursor Settings > MCP
  2. Click + Add New MCP Server
  3. Fill in the form:
    • Name: Whois Lookup (or any name you prefer)
    • Type: command
    • Command: npx -y @bharathvaj/whois-mcp@latest

Installation - Project-specific

Add an .cursor/mcp.json file to your project:

{
  "mcpServers": {
    "whois": {
      "command": "npx",
      "args": [
        "-y",
        "@bharathvaj/whois-mcp@latest"
      ]
    }
  }
}

Usage

Once configured, the whois tools will be automatically available to the Cursor AI Agent. You can:

  1. The tool will be listed under Available Tools in MCP settings
  2. Agent will automatically use it when relevant
  3. You can explicitly ask Agent to send notifications

Using with Roo Code

Access the MCP settings by clicking “Edit MCP Settings” in Roo Code settings or using the “Roo Code: Open MCP Config” command in VS Code's command palette.

{
  "mcpServers": {
    "whois": {
      "command": "npx",
      "args": [
        "-y",
        "@bharathvaj/whois-mcp@latest"
      ]
    }
  }
}
  1. The whois capabilities will be available to Roo Code's AI agents

Development

# Install dependencies
pnpm install

# Build
pnpm build

Debugging the Server

To debug your server, you can use the MCP Inspector.

First build the server

pnpm build

Run the following command in your terminal:

# Start MCP Inspector and server with all tools
npx @modelcontextprotocol/inspector node dist/index.js

FAQ

Common questions

Discussion

Questions & comments · 0

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