Domain Check

Fast domain availability checker with RDAP/WHOIS — batch checks, TLD presets, and name generation.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "domain-check-2": {
      "command": "npx",
      "args": [
        "-y",
        "domain-check-2"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

domain-check

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

domain-check demo

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

Method	Command	Notes
Homebrew (macOS)	`brew install domain-check`	Easiest install for macOS users
Cargo (CLI)	`cargo install domain-check`	Works on all Rust-supported platforms
Cargo (MCP)	`cargo install domain-check-mcp`	MCP server for AI agents
GitHub Releases	Download binaries	CLI + MCP binaries for macOS, Linux, Windows

Quick Start

bash

# 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:

text

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

server.ts

# 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:

text

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

Pretty (--pretty) — grouped by status with summary:

text

── Available (1) ──────────────────────────────
  myapp.io

── Taken (2) ──────────────────────────────────
  myapp.com
  myapp.dev

3 domains in 0.4s  |  1 available  |  2 taken  |  0 unknown

JSON (--json) — structured, pipe to jq:

config.json

[
  {
    "domain": "myapp.com",
    "available": false,
    "method": "RDAP"
  },
  {
    "domain": "myapp.io",
    "available": true,
    "method": "RDAP"
  }
]

CSV (--csv) — import into spreadsheets or databases:

text

domain,status,method
myapp.com,TAKEN,RDAP
myapp.io,AVAILABLE,RDAP

Info (--info) — registrar, dates, and status codes:

text

myapp.com TAKEN
  Registrar: Example Registrar, Inc.
  Created: 2015-03-12  Expires: 2026-03-12
  Status: clientTransferProhibited

Full reference: docs/CLI.md

Smart Presets

11 built-in presets covering common domains strategies:

Preset	TLDs	Use case
`startup`	com, org, io, ai, tech, app, dev, xyz	Tech startups
`popular`	com, net, org, io, ai, app, dev, tech, me, co, xyz	General coverage
`classic`	com, net, org, info, biz	Traditional gTLDs
`enterprise`	com, org, net, info, biz, us	Business and government
`tech`	io, ai, app, dev, tech, cloud, software, + 5 more	Developer tools
`creative`	design, art, studio, media, photography, + 5 more	Artists and media
`ecommerce`	shop, store, market, sale, deals, + 3 more	Online retail
`finance`	finance, capital, fund, money, investments, + 4 more	Fintech
`web`	web, site, website, online, blog, page, + 3 more	Web services
`trendy`	xyz, online, site, top, icu, fun, space, + 6 more	New gTLDs
`country`	us, uk, de, fr, ca, au, br, in, nl	International

bash

domain-check --list-presets                          # See all presets with full TLD lists
domain-check mybrand --preset creative --pretty      # Use a preset

Define custom presets in your config file:

toml

[custom_presets]
my_stack = ["com", "io", "dev", "app"]

Configuration

Create domain-check.toml in your project directory:

toml

[defaults]
concurrency = 25
preset = "startup"
pretty = true
timeout = "8s"
bootstrap = true

[custom_presets]
my_startup = ["com", "io", "ai", "dev", "app"]

[generation]
prefixes = ["get", "my"]
suffixes = ["hub", "ly"]

Config lookup order: ./domain-check.toml > ~/.domain-check.toml > ~/.config/domain-check/config.toml

Common environment variables:

bash

DC_CONCURRENCY=50    DC_PRESET=startup    DC_TLD=com,io,dev
DC_PRETTY=true       DC_TIMEOUT=10s       DC_BOOTSTRAP=true
DC_PREFIX=get,my     DC_SUFFIX=hub,ly     DC_FILE=domains.txt

Automation & CI

bash

# Non-interactive structured output
domain-check --file required-domains.txt --json

# Pipe to jq
domain-check --pattern "app\d" -t com --yes --json | jq '.[] | select(.available==true)'

# Stream live results for long runs
domain-check --file large-list.txt --concurrency 75 --streaming

# Large batch with no prompts
domain-check --file huge-list.txt --all --force --yes --csv > results.csv

CI-friendly behavior:

--yes / --force skip all confirmation prompts
Non-TTY environments (piped, CI) never prompt — scripts are never blocked
Spinner writes to stderr; stdout stays clean for piping
--no-bootstrap for deterministic, offline-safe checks against 32 hardcoded TLDs

Automation guide: docs/AUTOMATION.md

Library

Use domain-check-lib directly in Rust projects:

toml

[dependencies]
domain-check-lib = "1.0.2"

server.ts

use domain_check_lib::DomainChecker;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let checker = DomainChecker::new();
    let result = checker.check_domain("example.com").await?;
    println!("{} -> {:?}", result.domain, result.available);
    Ok(())
}

Library docs: domain-check-lib/README.md | docs.rs

MCP Server

domain-check-mcp exposes domain checking as tools for AI coding agents via the Model Context Protocol. Works with any MCP-compatible client.

bash

# Install
cargo install domain-check-mcp

# Add to your agent (Claude Code example — works similarly for Codex, Gemini CLI, etc.)
claude mcp add domain-check -- domain-check-mcp

6 tools available: check_domain, check_domains, check_with_preset, generate_names, list_presets, domain_info.

Then ask your agent naturally: "Is coolstartup.com available?" or "Check mybrand across the startup preset".

Supports: Claude Code, Claude Desktop, VS Code Copilot, Cursor, Windsurf, JetBrains, OpenAI Codex CLI, Gemini CLI, and any MCP stdio client.

Read the full README →View source on GitHub →

Related MCP Servers

View all in Developer Tools View all alternatives

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

GitHub stars

306

Stargazers on the source repository.

npm downloads

Package downloads in the last 30 days.

Last commit

3mo ago

Most recent push to the default branch.

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Domain Check

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "domain-check": { "command": "npx", "args": ["-y", "domain-check"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

39Quality signal: Fair · 39/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools11/30

Adoption & activity8/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Domain Check →Install in Claude Desktop Install in Cursor Install in VS Code

Domain Check

Fast domain availability checker with RDAP/WHOIS — batch checks, TLD presets, and name generation.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "domain-check-2": {
      "command": "npx",
      "args": [
        "-y",
        "domain-check-2"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

domain-check

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

domain-check demo

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

Method	Command	Notes
Homebrew (macOS)	`brew install domain-check`	Easiest install for macOS users
Cargo (CLI)	`cargo install domain-check`	Works on all Rust-supported platforms
Cargo (MCP)	`cargo install domain-check-mcp`	MCP server for AI agents
GitHub Releases	Download binaries	CLI + MCP binaries for macOS, Linux, Windows

Quick Start

bash

# 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:

text

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

server.ts

# 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:

text

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

Pretty (--pretty) — grouped by status with summary:

text

── Available (1) ──────────────────────────────
  myapp.io

── Taken (2) ──────────────────────────────────
  myapp.com
  myapp.dev

3 domains in 0.4s  |  1 available  |  2 taken  |  0 unknown

JSON (--json) — structured, pipe to jq:

config.json

[
  {
    "domain": "myapp.com",
    "available": false,
    "method": "RDAP"
  },
  {
    "domain": "myapp.io",
    "available": true,
    "method": "RDAP"
  }
]

CSV (--csv) — import into spreadsheets or databases:

text

domain,status,method
myapp.com,TAKEN,RDAP
myapp.io,AVAILABLE,RDAP

Info (--info) — registrar, dates, and status codes:

text

myapp.com TAKEN
  Registrar: Example Registrar, Inc.
  Created: 2015-03-12  Expires: 2026-03-12
  Status: clientTransferProhibited

Full reference: docs/CLI.md

Smart Presets

11 built-in presets covering common domains strategies:

Preset	TLDs	Use case
`startup`	com, org, io, ai, tech, app, dev, xyz	Tech startups
`popular`	com, net, org, io, ai, app, dev, tech, me, co, xyz	General coverage
`classic`	com, net, org, info, biz	Traditional gTLDs
`enterprise`	com, org, net, info, biz, us	Business and government
`tech`	io, ai, app, dev, tech, cloud, software, + 5 more	Developer tools
`creative`	design, art, studio, media, photography, + 5 more	Artists and media
`ecommerce`	shop, store, market, sale, deals, + 3 more	Online retail
`finance`	finance, capital, fund, money, investments, + 4 more	Fintech
`web`	web, site, website, online, blog, page, + 3 more	Web services
`trendy`	xyz, online, site, top, icu, fun, space, + 6 more	New gTLDs
`country`	us, uk, de, fr, ca, au, br, in, nl	International

bash

domain-check --list-presets                          # See all presets with full TLD lists
domain-check mybrand --preset creative --pretty      # Use a preset

Define custom presets in your config file:

toml

[custom_presets]
my_stack = ["com", "io", "dev", "app"]

Configuration

Create domain-check.toml in your project directory:

toml

[defaults]
concurrency = 25
preset = "startup"
pretty = true
timeout = "8s"
bootstrap = true

[custom_presets]
my_startup = ["com", "io", "ai", "dev", "app"]

[generation]
prefixes = ["get", "my"]
suffixes = ["hub", "ly"]

Config lookup order: ./domain-check.toml > ~/.domain-check.toml > ~/.config/domain-check/config.toml

Common environment variables:

bash

DC_CONCURRENCY=50    DC_PRESET=startup    DC_TLD=com,io,dev
DC_PRETTY=true       DC_TIMEOUT=10s       DC_BOOTSTRAP=true
DC_PREFIX=get,my     DC_SUFFIX=hub,ly     DC_FILE=domains.txt

Automation & CI

bash

# Non-interactive structured output
domain-check --file required-domains.txt --json

# Pipe to jq
domain-check --pattern "app\d" -t com --yes --json | jq '.[] | select(.available==true)'

# Stream live results for long runs
domain-check --file large-list.txt --concurrency 75 --streaming

# Large batch with no prompts
domain-check --file huge-list.txt --all --force --yes --csv > results.csv

CI-friendly behavior:

--yes / --force skip all confirmation prompts
Non-TTY environments (piped, CI) never prompt — scripts are never blocked
Spinner writes to stderr; stdout stays clean for piping
--no-bootstrap for deterministic, offline-safe checks against 32 hardcoded TLDs

Automation guide: docs/AUTOMATION.md

Library

Use domain-check-lib directly in Rust projects:

toml

[dependencies]
domain-check-lib = "1.0.2"

server.ts

use domain_check_lib::DomainChecker;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let checker = DomainChecker::new();
    let result = checker.check_domain("example.com").await?;
    println!("{} -> {:?}", result.domain, result.available);
    Ok(())
}

Library docs: domain-check-lib/README.md | docs.rs

MCP Server

domain-check-mcp exposes domain checking as tools for AI coding agents via the Model Context Protocol. Works with any MCP-compatible client.

bash

# Install
cargo install domain-check-mcp

# Add to your agent (Claude Code example — works similarly for Codex, Gemini CLI, etc.)
claude mcp add domain-check -- domain-check-mcp

6 tools available: check_domain, check_domains, check_with_preset, generate_names, list_presets, domain_info.

Then ask your agent naturally: "Is coolstartup.com available?" or "Check mybrand across the startup preset".

Supports: Claude Code, Claude Desktop, VS Code Copilot, Cursor, Windsurf, JetBrains, OpenAI Codex CLI, Gemini CLI, and any MCP stdio client.

Read the full README →View source on GitHub →

Related MCP Servers

View all in Developer Tools View all alternatives

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

GitHub stars

306

Stargazers on the source repository.

npm downloads

Package downloads in the last 30 days.

Last commit

3mo ago

Most recent push to the default branch.

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Domain Check

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "domain-check": { "command": "npx", "args": ["-y", "domain-check"] } }

AllMCPs Directory Badge

Full Badge Customizer

Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

Live Dynamic SVG Preview

Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/domain-check-2?style=directory)](https://allmcps.com/mcp/domain-check-2)

HTML Embed

<a href="https://allmcps.com/mcp/domain-check-2"><img src="https://allmcps.com/api/badge/domain-check-2?style=directory" alt="Domain Check on AllMCPs" /></a>

Technical Specs & Signals

CategoryDeveloper Tools

39Quality signal: Fair · 39/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools11/30

Adoption & activity8/15

Community engagement0/10

★ Spotlight Slot

Feature Your MCP Server

Get maximum visibility for your server across our directory, search results, and detail pages.

Spotlight Your Server

Own this project?

Free dofollow backlink: add your website and place the AllMCPs badge on it — no claim needed. We detect it automatically and keep it verified as long as the badge stays live.

Claim & get free dofollow

Share & Embed

Add our SVG badge (dark/light directory styles) or embeddable widget to your site.

Explore more

More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Domain Check →Install in Claude Desktop Install in Cursor Install in VS Code