WHOIS MCP Server
WHOIS MCP server enabling AI agents to perform domain and IP WHOIS lookups — querying domain registration information (registrar, registrant, creation/expiry dates, nameservers), IP address ownership (ASN, organization, abuse contacts), and network range data. Useful for network investigation, security research, threat intelligence, and domain monitoring workflows.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Public protocol. No credentials. Ethical use required. GDPR-aware: registrant data often redacted. Use for legitimate research only.
⚡ Reliability
Best When
A security analyst or network administrator needs to perform domain and IP reconnaissance as part of investigation, threat intelligence, or network monitoring workflows.
Avoid When
You need bulk WHOIS data at scale (use commercial WHOIS API providers), or need historical WHOIS records (use historical WHOIS services).
Use Cases
- • Querying domain registration details for security investigation from threat intelligence agents
- • Checking IP address ownership and ASN information from network security agents
- • Monitoring domain expiration dates from domain management agents
- • Investigating suspicious domains during incident response from SOC agents
- • Gathering OSINT on threat actors' infrastructure from security research agents
- • Verifying domain ownership for email security validation from email security agents
Not For
- • GDPR-redacted WHOIS data (many European domains show redacted registrant info)
- • Bulk domain enumeration at high volume without rate limiting
- • Building spam or stalking tools — WHOIS data must be used ethically
Interface
Authentication
No authentication for basic WHOIS lookups — WHOIS is a public protocol. Some WHOIS API providers require API keys for higher-rate or bulk lookups. Check which backend the MCP uses.
Pricing
WHOIS protocol is free. MCP server is free. High-volume use may need commercial WHOIS API (WHOISXML API, etc.).
Agent Metadata
Known Gotchas
- ⚠ GDPR has led to redaction of registrant PII in many WHOIS records (RDAP replacing traditional WHOIS)
- ⚠ WHOIS format varies significantly by TLD — parsing output requires TLD-specific handling
- ⚠ Bulk WHOIS lookups are rate-limited by registries — implement delays between lookups
- ⚠ ccTLD registries (country domains) have different WHOIS servers — may need registry-specific queries
- ⚠ WHOIS data may be outdated — registration data can lag behind actual ownership changes
- ⚠ Some TLDs (some ccTLDs) don't provide public WHOIS access
Alternatives
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Scores are editorial opinions as of 2026-03-07.