@nslookup-io/mcp-server

MCP (Model Context Protocol) server for DNS lookups, SSL certificate checks, security scanning, and domain intelligence — powered by nslookup.io.

Lets AI assistants like Claude perform real-time DNS queries across 53 record types and 18+ global DNS servers, check SSL certificates, scan for security issues, and more.

Tools

DNS Tools

Tool	Description
`dns_lookup`	Look up all common DNS records (A, AAAA, NS, MX, TXT, CNAME, SOA) for a domain
`dns_record`	Look up a specific DNS record type — supports all 53 types (HTTPS, DNSKEY, TLSA, SPF, etc.)
`dns_propagation`	Check DNS propagation across 18+ global servers (Cloudflare, Google, Quad9, regional, authoritative)
`webservers`	Get IPv4 and IPv6 addresses for a domain

Security & Certificate Tools

Tool	Description
`ssl_certificate`	Check SSL/TLS certificate — issuer, expiry, chain validity, cipher strength, SAN domains, TLS version
`bimi_vmc`	Check BIMI record and VMC (Verified Mark Certificate) — logo URL, trademark info, certificate expiry
`security_scan`	Scan a domain for security issues — SPF/DKIM/DMARC, cookie security, DNS misconfigurations
`uptime_check`	One-time HTTP uptime check — status, response time, HTTP status code

Supported DNS Record Types

A, AAAA, AFSDB, APL, AXFR, CAA, CDNSKEY, CDS, CERT, CNAME, CSYNC, DHCID, DLV, DNAME, DNSKEY, DS, EUI48, EUI64, HINFO, HIP, HTTPS, IPSECKEY, IXFR, KEY, KX, LOC, MX, NAPTR, NS, NSEC, NSEC3, NSEC3PARAM, NXT, OPENPGPKEY, OPT, PTR, RP, RRSIG, SIG, SMIMEA, SOA, SPF, SRV, SSHFP, SVCB, TA, TKEY, TLSA, TSIG, TXT, URI, ZONEMD

DNS Servers

cloudflare, google, quad9, opendns, authoritative, and regional servers in South Africa, Australia, India, Netherlands, Canada, USA, Brazil, Ukraine, Russia.

Setup

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "nslookup": {
      "command": "npx",
      "args": ["-y", "@nslookup-io/mcp-server"]
    }
  }
}

Claude Code

Available globally (all projects):

claude mcp add nslookup --scope user -- npx -y @nslookup-io/mcp-server

Or for a specific project only:

claude mcp add nslookup --scope project -- npx -y @nslookup-io/mcp-server

Manual / Local

git clone https://github.com/nslookup-io/nslookup-mcp.git
cd nslookup-mcp
npm install
npm run build
npm start

Configuration

Environment Variable	Default	Description
`NSLOOKUP_API_URL`	`https://www.nslookup.io`	Base URL for the nslookup.io API

Example Prompts

Once configured, you can ask Claude things like:

"What are the DNS records for github.com?"
"Check the MX records for google.com"
"Has the DNS propagated for my-domain.com A record?"
"What IP addresses does cloudflare.com resolve to?"
"Show me the DNSKEY records for example.com"
"Check the SPF record for amazon.com"
"Check the SSL certificate for github.com"
"Does google.com have a BIMI record?"
"Run a security scan on example.com"
"Is https://cloudflare.com up right now?"
"Check DNS propagation for example.com NS records across all global servers"

Feedback

We'd love to hear from you! At nslookup.io, we're building a fast, reliable, and free DNS lookup tool and monitoring platform for everyone — from developers and sysadmins to everyday internet users.

Your feedback is what helps us improve. Whether you've spotted a bug, have a feature idea, or just want to share your thoughts — we're listening. Contact us.

License

Apache 2.0

@nslookup-io/mcp-server