Whois MCP
MCP ServerFree** - MCP server that performs whois lookup against domain, IP, ASN and TLD.
Capabilities5 decomposed
domain-whois-lookup-with-registrar-parsing
Medium confidencePerforms WHOIS lookups against domain names by querying authoritative WHOIS servers and parsing structured registrar responses to extract registration details, expiration dates, nameservers, and registrant information. Implements server-side WHOIS protocol communication (RFC 3912) with automatic fallback to public WHOIS gateways when direct server queries fail, returning normalized JSON output compatible with MCP tool schemas.
Implements MCP server wrapper around WHOIS protocol with automatic registrar detection and response normalization, allowing Claude and other MCP clients to query domain metadata directly without external API dependencies or authentication
Lighter-weight than commercial WHOIS APIs (no rate-limit quotas or API keys required) and more flexible than hardcoded domain lookup tools because it exposes raw WHOIS protocol access through MCP's standardized tool interface
ip-address-whois-lookup-with-asn-resolution
Medium confidencePerforms WHOIS lookups against IPv4 and IPv6 addresses by querying Regional Internet Registries (RIRs: ARIN, RIPE, APNIC, LACNIC, AFRINIC) and extracting autonomous system number (ASN), network range, organization ownership, and geolocation hints. Implements automatic RIR selection based on IP address space allocation, with fallback to secondary WHOIS servers when primary RIR is unreachable.
Automatically routes IP WHOIS queries to correct Regional Internet Registry based on IP address space allocation, with built-in ASN resolution and multi-RIR fallback logic, eliminating need for clients to know RIR geography
More comprehensive than simple IP geolocation APIs because it returns authoritative ASN and network ownership data directly from RIRs, and more reliable than third-party IP databases because it queries primary sources without caching delays
asn-whois-lookup-with-network-enumeration
Medium confidencePerforms WHOIS lookups against Autonomous System Numbers (ASNs) by querying RIRs and extracting organization details, network prefixes, routing policy information, and abuse contacts. Implements ASN-to-network mapping to enumerate all IP ranges announced by a given AS, supporting both IPv4 and IPv6 prefix queries with optional filtering by address family.
Implements ASN-to-prefix enumeration by querying RIR WHOIS servers and parsing network prefix lists, allowing clients to discover all IP ranges operated by an AS without requiring BGP route collectors or third-party databases
More authoritative than BGP route collectors (which show only actively announced routes) because it returns WHOIS-registered prefixes directly from RIRs, and more complete than IP geolocation databases because it includes routing policy and abuse contact data
tld-whois-lookup-with-registry-metadata
Medium confidencePerforms WHOIS lookups against top-level domains (TLDs) by querying the IANA WHOIS server and registry-specific WHOIS servers, extracting registry operator information, nameserver details, DNSSEC configuration, and registry contact information. Implements TLD-to-registry mapping with automatic fallback to IANA when registry-specific servers are unavailable.
Implements TLD-specific WHOIS routing with automatic registry detection and fallback to IANA, exposing registry-level metadata (operator, nameservers, DNSSEC) through a unified MCP tool interface without requiring clients to know registry-specific server addresses
More direct than IANA zone file parsing because it queries authoritative WHOIS servers for real-time registry metadata, and more comprehensive than DNS-only validation because it includes administrative contacts and registry operator information
mcp-tool-schema-based-whois-integration
Medium confidenceExposes WHOIS lookup capabilities as standardized MCP tools with JSON schema definitions, allowing Claude and other MCP clients to invoke domain, IP, ASN, and TLD lookups through natural language requests. Implements tool parameter validation, error handling with user-friendly messages, and response formatting compatible with Claude's tool-use protocol, enabling seamless integration into multi-step agent workflows.
Implements MCP tool server pattern with standardized JSON schema definitions for domain, IP, ASN, and TLD WHOIS lookups, enabling Claude and other MCP clients to invoke WHOIS queries through natural language without manual API calls or parameter construction
More integrated than standalone WHOIS CLI tools because it exposes capabilities through MCP's standardized tool interface, allowing seamless composition with other tools in multi-step agent workflows; more flexible than hardcoded WHOIS integrations because schema-based approach allows clients to discover and invoke tools dynamically
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓Security researchers performing domain reconnaissance
- ✓DevOps engineers automating DNS and domain infrastructure audits
- ✓MCP client applications needing domain metadata enrichment
- ✓Teams building domain monitoring or expiration alert systems
- ✓Security operations teams performing IP-based threat intelligence
- ✓Network engineers auditing IP space allocation and ownership
- ✓MCP agents building automated incident response workflows
- ✓Developers building IP geolocation or ASN enrichment pipelines
Known Limitations
- ⚠Rate-limited by WHOIS servers (typically 1-5 queries per second per IP); bulk operations may require delays between requests
- ⚠Registrar-specific response formats require custom parsing logic; some registrars return obfuscated or redacted data due to GDPR/privacy policies
- ⚠No caching layer built-in; repeated queries for same domain hit WHOIS servers each time, increasing latency
- ⚠Timeout handling depends on WHOIS server responsiveness; some servers may take 5-10 seconds to respond
- ⚠RIR response times vary significantly (ARIN typically fast, APNIC may be slower); queries can take 2-10 seconds
- ⚠IPv6 WHOIS data is less complete than IPv4; some RIRs have sparse IPv6 registrations
Requirements
Input / Output
UnfragileRank
UnfragileRank is computed from adoption signals, documentation quality, ecosystem connectivity, match graph feedback, and freshness. No artifact can pay for a higher rank.
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** - MCP server that performs whois lookup against domain, IP, ASN and TLD.
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