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\n

@cyanheads/whois-mcp-server

\n

Look up domain registration, check availability, fetch DNS records, and resolve IPs and ASNs via RDAP and DNS-over-HTTPS via MCP. STDIO or Streamable HTTP.\n

6 Tools
\n

\n
\n\n
\n\n[![Version](https://img.shields.io/badge/Version-0.1.6-blue.svg?style=flat-square)](./CHANGELOG.md) [![License](https://img.shields.io/badge/License-Apache%202.0-orange.svg?style=flat-square)](./LICENSE) [![Docker](https://img.shields.io/badge/Docker-ghcr.io-2496ED?style=flat-square&logo=docker&logoColor=white)](https://github.com/users/cyanheads/packages/container/package/whois-mcp-server) [![MCP SDK](https://img.shields.io/badge/MCP%20SDK-^2.1.0-green.svg?style=flat-square)](https://modelcontextprotocol.io/) [![npm](https://img.shields.io/npm/v/@cyanheads/whois-mcp-server?style=flat-square&logo=npm&logoColor=white)](https://www.npmjs.com/package/@cyanheads/whois-mcp-server) [![TypeScript](https://img.shields.io/badge/TypeScript-^7.0.2-3178C6.svg?style=flat-square)](https://www.typescriptlang.org/) [![Bun](https://img.shields.io/badge/Bun-v1.4.2-blueviolet.svg?style=flat-square)](https://bun.sh/)\n\n
\n\n
\n\n[![Install in Claude Desktop](https://img.shields.io/badge/Install_in-Claude_Desktop-D97757?style=for-the-badge&logo=anthropic&logoColor=white)](https://github.com/cyanheads/whois-mcp-server/releases/latest/download/whois-mcp-server.mcpb) [![Install in Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=whois-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvd2hvaXMtbWNwLXNlcnZlciJdfQ==) [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install_Server-0098FF?style=for-the-badge&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode:mcp/install?%7B%22name%22%3A%22whois-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads%2Fwhois-mcp-server%22%5D%7D)\n\n[![Framework](https://img.shields.io/badge/Built%20on-@cyanheads/mcp--ts--core-67E8F9?style=flat-square)](https://www.npmjs.com/package/@cyanheads/mcp-ts-core)\n\n
\n\n---\n\n## Overview\n\nDomain and network intelligence via RDAP and DNS-over-HTTPS. Look up domain registrations, check availability, fetch DNS records, and resolve IPs and ASNs to their registries — all via public, keyless data sources. Runs as a stdio process or a local Streamable HTTP server.\n\n### Tools\n\n| Tool | Description |\n|:-----|:------------|\n| `whois_lookup_domain` | Full domain registration record — registrar, created/expiry dates, nameservers, EPP status, DNSSEC, registrant org |\n| `whois_check_availability` | Check whether a domain is registered or available for registration |\n| `whois_get_dns` | DNS records for any hostname via DNS-over-HTTPS (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, PTR) |\n| `whois_lookup_ip` | IP or CIDR netblock, org, country, abuse contact, and reverse DNS via RIR RDAP |\n| `whois_lookup_asn` | Resolve an ASN to its org name, country, and RIR source |\n| `whois_get_dossier` | One-call domain triage — registration + DNS in parallel, normalized into a single record with factual signals |\n\n---\n\n## Capability reference\n\n### `whois_lookup_domain` tool\n\n- Accepts a fully qualified domain name and selects the registry RDAP server through IANA bootstrap.\n- Returns registrar, registration dates, nameservers, EPP status, DNSSEC, and `registrant_redacted`; throws `rdap_no_coverage` or `domain_not_found` when no record can be returned.\n\n---\n\n### `whois_check_availability` tool\n\n- Accepts a fully qualified domain name for a registration check.\n- Returns `available: true` for RDAP 404, `false` with registrar and expiry for a registered domain, or `null` with `rdap_coverage: false` when coverage is absent.\n\n---\n\n### `whois_get_dns` tool\n\n- Accepts a hostname and optional nonempty `types`: A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, PTR; omission defaults to A, AAAA, MX, TXT, NS. Duplicate types are queried once.\n- Returns records with TTLs and ordered `query_sources: [{type, source}]`, including empty answers and NXDOMAIN. Legacy `source` is `cloudflare` if any query consumed a successful Cloudflare response, otherwise `nextdns`; a nonexistent domain returns `nxdomain: true` as data.\n\n---\n\n### `whois_lookup_ip` tool\n\n- Accepts a complete IPv4/IPv6 address with at most one decimal CIDR prefix (0–32 / 0–128); no whitespace, zone IDs, or brackets. Queries the base address and echoes the original `ip`. IPv4-mapped IPv6 uses the embedded IPv4 for policy, RDAP, and PTR; other IPv6 uses 32 reversed PTR nibbles.\n- Returns netblock CIDR, organization, country, abuse contact, and best-effort PTR (`null` on failure); throws `invalid_ip` for malformed input or `ip_not_found` on an RIR RDAP 404.\n- `private_range` enforces an explicit policy: IPv4 `0.0.0.0/8`, `10.0.0.0/8`, `100.64.0.0/10`, `127.0.0.0/8`, `169.254.0.0/16`, `172.16.0.0/12`, `192.168.0.0/16`, `255.0.0.0/8`; IPv6 `::1/128`, `fc00::/7`, `fe80::/10`. Other special-use addresses remain eligible for registry records or normal no-coverage/not-found outcomes.\n\n---\n\n### `whois_lookup_asn` tool\n\n- Accepts a decimal ASN from 1 to 4294967295 with an optional case-insensitive `AS` prefix and leading `+` (e.g., `AS15169`, `AS 15169`, `+15169`). Outer whitespace and whitespace after `AS` are allowed; whitespace inside digits or after `+`, suffixes, decimals, and out-of-range values return `invalid_asn`.\n- Returns `name`, `org_name`, `country`, `rir`, `start_autnum`, and `end_autnum`; throws `asn_not_found` when no ASN record exists.\n\n---\n\n### `whois_get_dossier` tool\n\n- Accepts a fully qualified domain name for parallel registration and A/MX/NS/TXT lookups.\n- Returns registration, DNS, domain age, privacy status, and inferred NS/MX providers. Individual failures remain partial data in `rdap_source_error` or `dns_source_error`; `both_legs_failed` means neither source succeeded.\n\n---\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core): stdio and Streamable HTTP transports, pluggable auth (`none` / `jwt` / `oauth`), swappable storage (`in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`), structured logging with optional OpenTelemetry tracing.\n\nRDAP / DNS-specific:\n\n- RDAP over HTTPS — no port-43 TCP dependency\n- IANA bootstrap auto-selection — correct registry RDAP server picked per TLD, RIR, or ASN range; bootstrap JSON cached in-memory for 24h\n- DNS-over-HTTPS via Cloudflare and NextDNS — dual-provider with per-type routing (NextDNS for CAA; Cloudflare for all others) and automatic fallback\n- No API keys required — all sources (IANA, registry RDAP endpoints, RIR RDAP, Cloudflare DoH, NextDNS DoH) are public and keyless\n\nAgent-friendly output:\n\n- Coverage signaled two ways — `rdap_coverage: false` returned as data by `whois_check_availability` and `whois_get_dossier`, while `whois_lookup_domain` throws `rdap_no_coverage` for the same case\n- Privacy redaction surfaced as a field — `registrant_redacted: true` rather than silently absent contact data\n- Partial failure model — `whois_get_dossier` marks individual legs with a `source_error` field and continues; only both-legs-fail escalates to an error\n- Factual signals, not scores — `age_days`, `privacy_redacted`, `ns_provider`, `mx_provider` are real data, not synthesized risk scores\n\n---\n\n## Getting started\n\nNo API keys or accounts required. Add the following to your MCP client configuration file.\n\n```json\n{\n \"mcpServers\": {\n \"whois-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/whois-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with npx (no Bun required):\n\n```json\n{\n \"mcpServers\": {\n \"whois-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/whois-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with Docker:\n\n```json\n{\n \"mcpServers\": {\n \"whois-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\n \"run\", \"-i\", \"--rm\",\n \"-e\", \"MCP_TRANSPORT_TYPE=stdio\",\n \"ghcr.io/cyanheads/whois-mcp-server:latest\"\n ]\n }\n }\n}\n```\n\nFor Streamable HTTP, set the transport and start the server:\n\n```sh\nMCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http\n# Server listens at http://localhost:3010/mcp\n```\n\n### Prerequisites\n\n- [Bun v1.4.0](https://bun.sh/) or higher (or Node.js v24+).\n- No API keys required — all data sources are public.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/whois-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd whois-mcp-server\n```\n\n3. **Install dependencies:**\n\n```sh\nbun install\n```\n\n4. **Configure environment:**\n\n```sh\ncp .env.example .env\n# All vars are optional — defaults work for most use cases\n```\n\n---\n\n## Configuration\n\n| Variable | Description | Default |\n|:---------|:------------|:--------|\n| `RDAP_TIMEOUT_MS` | HTTP timeout for RDAP requests in milliseconds. | `5000` |\n| `DOH_TIMEOUT_MS` | HTTP timeout for DNS-over-HTTPS requests in milliseconds. | `3000` |\n| `RDAP_MAX_RETRIES` | Max retry attempts on transient RDAP failures. | `2` |\n| `DOH_MAX_RETRIES` | Max retry attempts on transient DoH failures. | `2` |\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` |\n| `MCP_HTTP_PORT` | Port for HTTP server. | `3010` |\n| `MCP_AUTH_MODE` | Auth mode: `none`, `jwt`, or `oauth`. | `none` |\n| `MCP_LOG_LEVEL` | Log level (RFC 5424). | `info` |\n| `OTEL_ENABLED` | Enable [OpenTelemetry instrumentation](https://github.com/cyanheads/mcp-ts-core/tree/main/docs/telemetry). | `false` |\n\nSee [`.env.example`](./.env.example) for the full list of optional overrides.\n\n---\n\n## Running the server\n\n### Local development\n\n- **Build and run:**\n\n ```sh\n bun run rebuild\n bun run start:stdio\n # or\n bun run start:http\n ```\n\n- **Run checks and tests:**\n\n ```sh\n bun run devcheck # Lint, format, typecheck, security\n bun run test # Vitest test suite\n bun run lint:mcp # Validate MCP definitions against spec\n ```\n\n### Docker\n\n```sh\ndocker build -t whois-mcp-server .\ndocker run --rm -p 3010:3010 whois-mcp-server\n```\n\nThe Dockerfile defaults to HTTP transport, stateless session mode, and logs to `/var/log/whois-mcp-server`. OpenTelemetry peer dependencies are installed by default — build with `--build-arg OTEL_ENABLED=false` to omit them.\n\n---\n\n## Project structure\n\n| Path | Purpose |\n|:-----|:--------|\n| `src/index.ts` | Entry point — starts the app. |\n| `src/app.ts` | `createApp()` options — registers tools, inits services, declares the session mode. |\n| `src/config/` | Server-specific environment variable parsing and validation (Zod). |\n| `src/services/rdap/` | RDAP client — IANA bootstrap cache, domain/IP/ASN lookup, retry. |\n| `src/services/doh/` | DNS-over-HTTPS client — Cloudflare primary, NextDNS fallback. |\n| `src/mcp-server/tools/` | Tool definitions (`*.tool.ts`). |\n| `tests/` | Vitest tests mirroring `src/`. |\n| `docs/` | Design and API reference documents. |\n\n---\n\n## Development guide\n\nSee [`CLAUDE.md`](./CLAUDE.md) for development guidelines and architectural rules. The short version:\n\n- Handlers throw, framework catches — no `try/catch` in tool logic\n- Use `ctx.log` for request-scoped logging\n- Register new tools via `src/app.ts`'s `tools` array\n- Wrap external API calls: validate raw → normalize to domain type → return output schema; never fabricate missing fields\n\n---\n\n## Contributing\n\nIssues are welcome. Run checks and tests before submitting:\n\n```sh\nbun run devcheck\nbun run test\n```\n\n---\n\n## License\n\nApache-2.0 — see [LICENSE](LICENSE) for details.\n","readmeFilename":"README.md"}