Prefix WhoIs MCP Server: Install & Setup

Install Prefix WhoIs in Claude Code

Claude Code

claude mcp add --transport http prefix-whois https://pwhois.org/mcp/

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "prefix-whois": {
      "url": "https://pwhois.org/mcp/"
    }
  }
}

Frequently asked questions

What does the Prefix WhoIs MCP server do?

Live BGP routing table and registry lookups: IP origin, ASN prefixes, transit, org search.

Is the Prefix WhoIs MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Prefix WhoIs run locally or remotely?

Remote. Hosted by the provider. You connect with a URL, nothing to install.

How do I add Prefix WhoIs to Claude Code?

Run: claude mcp add --transport http prefix-whois https://pwhois.org/mcp/

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