FernTool Network Tools MCP server

FernTool — network toolbox MCP server & free IP API

<!-- mcp-name: com.ferntool/ip -->

FernTool is a fast, clean "what is my IP" and IP lookup tool. This repo documents its hosted, remote MCP server so AI assistants and agents (Claude, Cursor, VS Code Copilot and others) can:

• get the caller's public IP, ISP, ASN, location and timezone
• look up the country, ASN and network owner of any IPv4/IPv6 address
• detect Tor exit nodes, VPN/datacenter and cloud IPs (AWS, Google Cloud, Azure, Cloudflare, DigitalOcean, Oracle, Hetzner, OVH and more)
• batch look up to 100 IPs in one call
• run WHOIS (RDAP) for domains, IPs and ASNs, DNS lookups (A/AAAA/MX/TXT/NS/CNAME/SOA), reverse DNS and IPv4/IPv6 subnet math
• validate and classify IP addresses (public, private, loopback, documentation and so on)

No API key, no install, no sign-up. It's just a URL:

https://www.ferntool.com/mcp

Transport: MCP streamable HTTP (JSON-RPC 2.0, protocol 2025-06-18).

Connect

Claude Code

claude mcp add --transport http ferntool https://www.ferntool.com/mcp

Claude Desktop (claudedesktopconfig.json). Use Settings → Connectors → Add custom connector with the URL above, or bridge with mcp-remote:

{ "mcpServers": { "ferntool": { "command": "npx", "args": ["-y", "mcp-remote", "https://www.ferntool.com/mcp"] } } }

Cursor (~/.cursor/mcp.json or .cursor/mcp.json)

{ "mcpServers": { "ferntool": { "url": "https://www.ferntool.com/mcp" } } }

VS Code (.vscode/mcp.json)

{ "servers": { "ferntool": { "type": "http", "url": "https://www.ferntool.com/mcp" } } }

Ready-made files are in examples/.

Tools

Example lookup_ip result for 8.8.8.8:

{
  "valid": true, "version": 4, "ip": "8.8.8.8", "scope": "public",
  "source": "dbip-lite+iptoasn",
  "geo": { "country": "US", "country_name": "United States", "asn": 15169, "isp": "GOOGLE",
           "timezone": "America/New_York", "timezones": ["America/New_York", "..."] },
  "flags": { "is_tor": false, "is_datacenter": true, "provider": "Google Cloud" }
}

Example validate_ip result for 2001:db8::1:

Shortened. The full README is on GitHub.