Dns

io.github.ofershapPublished by GitHub account ofershapv1.0.1Updated Oct 24, 2026

MCP server for DNS lookups, reverse DNS, WHOIS, and domain checks — zero auth, zero config

VerifiedSTDIODesktop onlyDeveloper ToolsSecurity & Monitoring

Overview

AI-generated overview

Lets an assistant run DNS lookups, reverse DNS, nameserver checks, and WHOIS queries for domains and IP addresses.

What you can do
Provides tools for querying DNS records: dns_lookup covers A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, and PTR records; reverse_dns performs PTR lookups on IP addresses; resolve_all returns A, AAAA, MX, TXT, NS, and CNAME in one call; check_nameservers returns NS records; and whois queries registration data, following IANA referrals to the registrar. It uses Node.js built-in DNS resolution and public WHOIS servers.
When to use it
Useful during development when you need to inspect DNS records or domain ownership, such as debugging email delivery via MX records, checking nameservers for a new domain, or investigating a suspicious URL through WHOIS.
Requirements
Runs locally over stdio as an npm package (mcp-server-dns), typically started with npx, so Node.js is required. No accounts, API keys, environment variables, or headers are declared. Network access is needed for DNS and WHOIS queries.
Before you install
Queries are sent to DNS resolvers and public WHOIS servers, so the domains and IP addresses you look up leave your machine. The tools are read-only and no credentials are requested.

Installation

In SourceWeft

  1. Open Dns in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

mcp-server-dns

[npm version] [npm downloads] [CI] [TypeScript] [License: MIT]

DNS lookups, reverse DNS, WHOIS, and domain checks from your AI assistant. No API keys, no config. Powered by Node.js built-in DNS.

bash
npx mcp-server-dns

Works with Claude Desktop, Cursor, VS Code Copilot, and any MCP client. Uses Node.js native dns module, so there's nothing to sign up for.

[MCP server for DNS lookups, WHOIS queries, and domain checks]

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

ToolWhat it does
dns_lookupLook up A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, or PTR
reverse_dnsPerform reverse DNS (PTR) lookup on an IP address
resolve_allResolve A, AAAA, MX, TXT, NS, CNAME in one call
check_nameserversGet nameserver (NS) records for a domain
whoisQuery WHOIS data (follows IANA referrals to registrar)

Quick Start

Cursor

Add to .cursor/mcp.json:

json
{  "mcpServers": {    "dns": {      "command": "npx",      "args": ["-y", "mcp-server-dns"]    }  }}

Claude Desktop

Add to claude_desktop_config.json:

json
{  "mcpServers": {    "dns": {      "command": "npx",      "args": ["-y", "mcp-server-dns"]    }  }}

VS Code

Add to user settings or .vscode/mcp.json:

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

bash
git clone https://github.com/ofershap/mcp-server-dns.gitcd mcp-server-dnsnpm installnpm testnpm run build

See also

More MCP servers and developer tools on my portfolio.

Author

[Made by ofershap]

[LinkedIn] [GitHub]

README built with README Builder

License

MIT © 2026 Ofer Shapira

Source: README.md at commit f557553

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v1.0.1LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts