Domain Check MCP Server

domain-check

Universal domain exploration engine: fast domain availability checks across the internet — as a CLI, Rust library, and MCP server for AI agents.

Quick Links: Installation | Quick Start | Use Cases | Output Formats | Presets | Configuration | Automation | Library | MCP Server | FAQ | Contributing

Why domain-check

• 1,200+ TLDs out of the box — IANA bootstrap loads the full registry automatically. No config needed. 32 hardcoded TLDs work offline as fallback.
• Dual-protocol engine — RDAP-first with automatic WHOIS fallback. IANA server discovery covers ~189 ccTLDs that lack RDAP (.es, .co, .eu, .jp).
• Fast — up to 100 concurrent checks, streaming results as they complete. 2.7 MB release binary.
• Domain generation — pattern expansion (\w=letter, \d=digit, ?=either), prefix/suffix permutations, and --dry-run to preview before checking.
• 11 curated presets — startup, tech, creative, finance, ecommerce, and more. Or define your own in config.
• Rich output — grouped pretty display, JSON, CSV. Registrar info, creation/expiration dates, and status codes with --info.
• CI and automation friendly — --json/--csv to stdout, --yes to skip prompts, --force for large runs, automatic non-TTY detection.
• Configurable — TOML config files, DC_* environment variables, custom presets, and clear precedence rules.
• Agent-native — MCP server exposes all tools to AI coding agents (Claude, Codex, Gemini, Cursor, VS Code Copilot, and any MCP client).
• CLI + library + MCP — same engine powers the CLI, `domain-check-lib` (Rust library), and `domain-check-mcp` (MCP server).

Installation

Quick Start

# Check a single domain
domain-check example.com

# Expand a base name across TLDs
domain-check mystartup -t com,org,io,dev

# Use a curated preset
domain-check myapp --preset startup --pretty

# Generate names with a pattern (preview only)
domain-check --pattern "app\d" -t com --dry-run

# Add prefixes and suffixes
domain-check myapp --prefix get,try --suffix hub,ly -t com,io

# Get registrar and date info
domain-check target.com --info

# Check every known TLD
domain-check brand --all --batch

Pretty output:

domain-check v0.9.1 — Checking 8 domains
Preset: startup | Concurrency: 20

── Available (3) ──────────────────────────────
  rustcloud.org
  rustcloud.ai
  rustcloud.app

── Taken (5) ──────────────────────────────────
  rustcloud.com
  rustcloud.io
  rustcloud.tech
  rustcloud.dev
  rustcloud.xyz

8 domains in 0.8s  |  3 available  |  5 taken  |  0 unknown

Use Cases

# Startup naming — scan tech TLDs for your brand
domain-check coolname --preset startup --pretty

# Brand protection — audit every TLD for your trademark
domain-check mybrand --all --json > audit.json

# Pre-purchase validation — check registrar and expiry before buying
domain-check target.com --info

# Bulk pipeline — feed a list, export results
domain-check --file ideas.txt --preset tech --csv > results.csv

# Name generation — explore prefix/suffix combos
domain-check app --prefix get,my,try --suffix hub,ly -t com,io --dry-run

Output Formats

Default — one line per domain, colored status:

myapp.com TAKEN
myapp.io AVAILABLE
myapp.dev TAKEN

Pretty (