WhoisXML API MCP Server

io.github.whois-api-llc/mcp-whoisxmlapi

Documentation

WhoisXML API MCP Server

The official WhoisXML API MCP server: 32 first-party tools for WHOIS, DNS, IP geolocation, threat intelligence, typosquatting, email verification, and native bulk lookups — in Claude, Cursor, VS Code, LobeChat, or any MCP client.

Documentation: https://mcp.whoisxmlapi.com
npm package: @whoisxmlapidotcom/mcp-whoisxmlapi
Docker image: whoisxmlapidotcom/mcp-whoisxmlapi
MCP Registry: io.github.whois-api-llc/mcp-whoisxmlapi

This repository is the public listing home for the server. Distribution is via the hosted endpoint, npm, and Docker Hub; the implementation source is maintained privately by Whois API, Inc.

Hosted endpoint (no install)

Connect any remote-capable MCP client to the hosted server — authentication is via OAuth with your WhoisXML API key:

https://mcp-hosted.whoisxmlapi.com/mcp

{
  "mcpServers": {
    "whoisxmlapi": {
      "url": "https://mcp-hosted.whoisxmlapi.com/mcp"
    }
  }
}

Run locally

Requires a WhoisXML API key — get one at https://whoisxmlapi.com.

npm:

{
  "mcpServers": {
    "whoisxmlapi": {
      "command": "npx",
      "args": ["-y", "@whoisxmlapidotcom/mcp-whoisxmlapi"],
      "env": { "WHOISXMLAPI_TOKEN": "at_YOUR_KEY" }
    }
  }
}

Docker:

docker run -i --rm -e WHOISXMLAPI_TOKEN=at_YOUR_KEY whoisxmlapidotcom/mcp-whoisxmlapi

Tools (32)

Domain intelligence

Tool	What it does
`whois`	Current WHOIS/RDAP registration data for a domain — registrar, dates, nameservers, status, contacts.
`whois_history`	Full timeline of WHOIS changes — ownership transfers, registrar moves, nameserver swaps.
`domain_info`	Enriched WHOIS profile combining current + historical records to fill redacted fields.
`reverse_whois`	Every domain whose WHOIS record contains a free-text term (name, email, org, address).
`reverse_whois_advanced`	Field-specific WHOIS searches (e.g. `RegistrantContact.Organization`), up to 4 terms.
`domain_reputation`	0–100 trust score from live infrastructure and configuration checks.
`typosquatting`	Check whether a domain belongs to a typosquatting group, or expand the full group.
`categorization`	Classify a domain into IAB Content Taxonomy v3.1 categories.

DNS & infrastructure

Tool	What it does
`dns_lookup`	Current DNS records — A, AAAA, MX, NS, SOA, TXT, CNAME, PTR, SRV, CAA, DS, DNSKEY, or all.
`dns_history`	Historical DNS records (forward) or domains historically on an IP (reverse).
`reverse_dns`	Search DNS records by pattern and return matching domains.
`reverse_ip`	Every domain currently pointing at an IP, with first-/last-seen dates.
`reverse_mx`	Every domain using a specific MX server.
`reverse_ns`	Every domain delegated to a specific nameserver.
`subdomain_lookup`	Enumerate up to 10,000 known subdomains of a domain with seen timestamps.
`domain_and_subdomain_discovery`	Newly-registered domains/subdomains containing search terms (wildcards supported).
`ssl_certificates`	TLS certificate details — issuer, validity, SANs, chain trust.

IP intelligence

Tool	What it does
`ipgeolocation`	Country, region, city, ISP, ASN for an IP, domain, or email.
`ip_netblocks`	CIDR ranges, ASN, organisation, and registration dates for IP/ASN/org.

Threat & brand protection

Tool	What it does
`threat_intelligence`	Check a domain, URL, IP, CIDR, or file hash against malware/phishing/spam/botnet feeds.
`brand_alert`	Newly added/dropped/updated domains containing brand terms — typosquat & lookalike monitoring.
`registrant_alert`	New/changed domains whose WHOIS registrant fields match search terms.

Email

Tool	What it does
`email_verification`	Syntax, MX, and SMTP deliverability checks; flags disposable/role/free/catch-all.
`disposable_email_check`	Boolean verdict on disposable/temporary email providers.

Screenshots

Tool	What it does
`website_screenshot`	Capture a web page screenshot, returned as a native image content block.

Native bulk

Tool	What it does
`bulk_whois`	WHOIS for up to 10,000 domains in one call (native bulk, async `job_id` if long-running).
`bulk_email_verification`	Email verification for up to 10,000 addresses (native bulk, async if long-running).
`bulk_dns_lookup`	DNS lookups for up to 200 domains, fanned out concurrently.
`bulk_ip_geolocation`	IP geolocation for up to 200 IPs, fanned out concurrently.
`bulk_subdomain_lookup`	Subdomain discovery for up to 200 apex domains.
`bulk_job_status`	Progress of an in-flight bulk job.
`bulk_job_results`	Full per-input results of a completed bulk job.

Example prompts

"Look up the WHOIS for suspicious-domain.com and tell me if it's suspicious."
"Find all subdomains of example.com and check their DNS history."
"Check the threat intelligence reputation of 203.0.113.7 and what's hosted there."