domain-lookup

Domain Lookup

Use the domain-whois-mcp tools to answer questions about domain names.

When to Use

• User asks about domain registration info (registrar, dates, nameservers, status)
• User wants to check if a specific domain is available
• User wants to check multiple domains at once
• User asks about a TLD's WHOIS or RDAP servers
• User needs raw WHOIS data for debugging or IP/ASN queries
• User wants to know which protocol (WHOIS/RDAP) is available for a TLD

If the user is brainstorming a project name, route to the project-name-finder skill instead.

Tool Selection Guide

User Intent	Tool	Key Parameters
"Who owns example.com?"	whois_lookup	domain
"Is example.com available?"	domain_check	domain, method=auto
"Check these 10 domains"	bulk_domain_check	domains, concurrency
"RDAP info for example.com"	rdap_lookup	domain
"What WHOIS server handles .xyz?"	tld_info	tld
"Send raw WHOIS to specific server"	whois_raw	query, server
"Which TLDs support RDAP?"	rdap_bootstrap_info	filter (optional)
"Find WHOIS server for .tr"	find_whois_server	domain

Usage Patterns

Quick availability check

Use domain_check with method auto. It tries RDAP first (faster), falls back to WHOIS.

Bulk availability across TLDs

bulk_domain_check({
  domains: ["brand.com", "brand.io", "brand.dev", "brand.ai", "brand.co"],
  concurrency: 5
})

Full registration details

whois_lookup for WHOIS text + parsed fields, rdap_lookup for structured JSON.

Unknown or exotic TLD

Call tld_info first, then pick the appropriate lookup tool based on what it reports.

Response Interpretation

• Status codes like clientTransferProhibited, serverDeleteProhibited indicate registry locks
• DNSSEC: signedDelegation means the domain uses DNSSEC
• Expiration dates help identify domains that may become available soon
• Referral following means the tool automatically got thick WHOIS from the registrar

Limitations

• Some ccTLDs don't have public WHOIS services (the tool will report this)
• WHOIS rate limits vary by server — bulk checks use configurable concurrency
• Privacy/proxy services may mask registrant contact information
• RDAP is not available for all TLDs yet (check with rdap_bootstrap_info)