MCP DNS Intelligence: SPF, DMARC, DKIM, and dangling subdomains

MCP guide · DNS Intelligence

@guardbee/mcp-dns-intelligence lists DNS records, finds SPF/DMARC/DKIM issues, and flags dangling subdomains. It uses Node’s built-in dns/promises — no heavy deps, no API key.

What does it do?

Chat-based DNS and email-auth hygiene. Get findings like ‘no DMARC’, ‘SPF +all’, or ‘dead CNAME to cloud storage’ in plain language.

Who is it for?

• IT / security and email admins
• Teams inventorying brand subdomains
• Agencies running client domain health checks

What it is not

• Editing DNS zones or provider API automation
• Full brute-force subdomain discovery (uses a common-name list)

Features

MCP tools

Install with npm

Global install (handy for Claude Desktop / Cursor):

npm install -g @guardbee/mcp-dns-intelligence

or via npx (recommended with -y in config):

npx -y @guardbee/mcp-dns-intelligence

npm: @guardbee/mcp-dns-intelligence

Needs normal outbound DNS resolution.

Claude Desktop configuration

Config file paths:

• macOS~/Library/Application Support/Claude/claude_desktop_config.json
• Windows%APPDATA%\Claude\claude_desktop_config.json
• Linux~/.config/Claude/claude_desktop_config.json

Merge this block, then restart Claude Desktop:

{
  "mcpServers": {
    "guardbee-dns-intelligence": {
      "command": "npx",
      "args": [
        "-y",
        "@guardbee/mcp-dns-intelligence"
      ]
    }
  }
}

Cursor and other MCP clients

In Cursor, add the same command / args / env under Settings → MCP. stdio MCP servers use the same contract as Claude Desktop.

Example prompts in Claude

1. “Any DNS issues on example.com?”
2. “Audit email security for example.com — SPF, DMARC, DKIM”
3. “List subdomains of example.com and flag dangling ones”

Related links

• All MCP servers
• Integrations
• Start free Guardbee trial
• @guardbee/mcp-dns-intelligence on npm

Frequently asked questions