Summary
Plugs Node.js native DNS resolution and public WHOIS servers into Claude with no API keys or signup required. You get five tools: dns_lookup for A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, and PTR records, reverse_dns for IP to hostname lookups, resolve_all to fetch multiple record types in one shot, check_nameservers for NS queries, and whois with IANA referral following. Useful when you're debugging email delivery and need MX records, verifying nameserver propagation, or investigating domain ownership without leaving your editor. Runs via npx in Cursor, Claude Desktop, or VS Code with stdio transport.
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →
Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →
Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
mcp-server-dns
DNS lookups, reverse DNS, WHOIS, and domain checks from your AI assistant. No API keys, no config. Powered by Node.js built-in DNS.
npx mcp-server-dns
Works with Claude Desktop, Cursor, VS Code Copilot, and any MCP client. Uses Node.js native
dnsmodule, so there's nothing to sign up for.
Demo built with remotion-readme-kit
Why
DNS and WHOIS lookups come up more often than you'd think during development. Debugging email delivery? You need MX records. Setting up a new domain? Check the nameservers. Investigating a suspicious URL? WHOIS tells you who owns it. The existing MCP options for this require paid API keys (like WhoisXML API). This server uses Node.js built-in DNS resolution and public WHOIS servers, so it works out of the box with zero accounts or credentials.
Tools
| Tool | What it does |
|---|---|
dns_lookup | Look up A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, or PTR |
reverse_dns | Perform reverse DNS (PTR) lookup on an IP address |
resolve_all | Resolve A, AAAA, MX, TXT, NS, CNAME in one call |
check_nameservers | Get nameserver (NS) records for a domain |
whois | Query WHOIS data (follows IANA referrals to registrar) |
Quick Start
Cursor
Add to .cursor/mcp.json:
{
"mcpServers": {
"dns": {
"command": "npx",
"args": ["-y", "mcp-server-dns"]
}
}
}
Claude Desktop
Add to claude_desktop_config.json:
{
"mcpServers": {
"dns": {
"command": "npx",
"args": ["-y", "mcp-server-dns"]
}
}
}
VS Code
Add to user settings or .vscode/mcp.json:
{
"mcp": {
"servers": {
"dns": {
"command": "npx",
"args": ["-y", "mcp-server-dns"]
}
}
}
}
Examples
- "What are the DNS records for example.com?"
- "Do a reverse DNS lookup on 8.8.8.8"
- "Show me the WHOIS info for github.com"
- "What nameservers does cloudflare.com use?"
- "Resolve all record types for google.com"
- "Check the MX records for my-company.com"
Development
git clone https://github.com/ofershap/mcp-server-dns.git
cd mcp-server-dns
npm install
npm test
npm run build
See also
More MCP servers and developer tools on my portfolio.
Author
README built with README Builder
License
MIT © 2026 Ofer Shapira
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →