Brainstorm and check domain name availability rapidly with smart permutations and regex patterns.
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Significantly speeds up the domain brainstorming and checking process.
Biggest con
Regex patterns generating too many combinations (over 500,000) are skipped.
TL;DR - tldx
- Rapidly checks domain availability using RDAP, DNS, and WHOIS.
- Generates domain permutations with prefixes, suffixes, TLDs, and regex.
- Supports multiple output formats and integrates with AI agents via MCP.
Pricing: Free plan available
Best for: Growing teams
What is tldx?
tldx is a command-line tool designed to help users quickly brainstorm and check the availability of domain names. It leverages RDAP, DNS, and WHOIS lookups to provide fast and concurrent availability checks. The tool is particularly useful for developers, marketers, and entrepreneurs looking to find available domain names by generating various permutations based on keywords, prefixes, suffixes, and Top-Level Domains (TLDs).
Users can define custom TLDs to check, utilize predefined TLD presets (e.g., 'popular', 'tech'), and even employ regex patterns to generate complex domain combinations, such as all 3-letter .com domains. tldx supports multiple output formats including text, JSON, and CSV, and can filter results to show only available domains or limit the number of results. It also includes an MCP (Model Context Protocol) server for integration with AI agents, making it a versatile tool for automated domain discovery.
Available on: Web
Pros & Cons
Pros
- Significantly speeds up the domain brainstorming and checking process.
- Highly flexible with support for prefixes, suffixes, TLDs, and regex patterns.
- Offers various output formats for easy data processing and integration.
- Can be integrated with AI agents for advanced automation.
- Provides TLD presets for convenience and targeted searches.
Cons
- Regex patterns generating too many combinations (over 500,000) are skipped.
- Requires command-line usage, which might be less intuitive for non-technical users.
- Brace expansion for permutations is primarily supported on macOS and Linux bash/zsh.
Key Features
Smart keyword-based domain permutations (prefixes, suffixes, TLDs)Regex pattern support for generating domain combinationsFast and concurrent availability checks with RDAPStreams results as they are foundMultiple output formats: text, json, json-stream, json-array, csv, grouped, grouped-tldTLD presets to quickly select curated TLD setsOptional filtering by domain lengthMCP server for AI agent integration
Pricing Plans
Free TrialPricing checked Jul 7, 2026
Free
$0 USD per month
- Unlimited public/private repositories
- Dependabot security and version updates
- 2,000 CI/CD minutes/month (Free for public repositories)
- 500MB of Packages storage (Free for public repositories)
- Issues & Projects
- Community support
Team
$4 USD per user/month
- Everything included in Free
- Access to GitHub Codespaces
- Repository rules
- Multiple reviewers in pull requests
- Draft pull requests
- Code owners
- Required reviewers
- Pages and Wikis
Enterprise
Starting at $21 USD per user/month
- Everything included in Team
- Data residency
- Enterprise Managed Users
- User provisioning through SCIM
- Enterprise Account to centrally manage multiple organizations
- Environment protection rules
- Repository rules
- Audit Log API
Reviews
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tldx FAQ
How does tldx assist with domain name brainstorming for SEO?
tldx helps with SEO by rapidly generating and checking domain name availability based on keywords, prefixes, suffixes, and custom TLDs. It allows users to explore many domain combinations quickly, which can inform decisions for new websites or marketing campaigns.
What kind of user benefits most from tldx?
tldx is most beneficial for developers, marketers, and entrepreneurs who need to quickly brainstorm and verify the availability of domain names. Its command-line interface and advanced features cater to users comfortable with technical tools and automation.
How is tldx priced?
tldx is available on a free tier, allowing users to get started without initial cost. Paid plans are offered for those requiring more extensive usage or additional features.
Can tldx integrate with other tools or workflows?
Yes, tldx supports multiple output formats such as text, JSON, and CSV, which facilitates integration with other data processing tools. It also includes an MCP server, enabling integration with AI agents for advanced automation in domain discovery.
Does tldx support complex domain pattern generation?
tldx supports complex domain pattern generation through the use of regex patterns, allowing for highly specific combinations like all 3-letter .com domains. However, regex patterns that generate over 500,000 combinations are skipped to manage processing load.
Which operating systems support brace expansion for permutations in tldx?
Brace expansion for permutations within tldx is primarily supported on macOS and Linux bash/zsh environments. This feature allows users to generate various domain name combinations efficiently on these operating systems.
What are the main limitations of tldx?
One limitation of tldx is that regex patterns generating over 500,000 combinations are automatically skipped. Additionally, it requires command-line usage, which may present a learning curve for users unfamiliar with such interfaces.
Source: github.com