tldx

Fast CLI to bulk-check domains via RDAP & MCP

Developer ToolsGitHubOpen Source

▲ 101 votes3 commentsLaunched May 25, 2026

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Finding a good domain is half the battle. tldx is a blazing-fast, concurrent CLI tool that generates and checks domain availability in bulk via RDAP. Mix keywords, prefixes/suffixes, or regex, and stream results to stdout, JSON, or CSV. Plus, tldx includes an MCP server, empowering AI agents (like Claude) to brainstorm and verify domains for you automatically! Install via Homebrew (brew install tldx). Say goodbye to rate-limits and legacy whois parsing. 100% Free & Open Source in Go.

AI Analysis

📝 Summary

tldx is a blazing-fast, concurrent CLI tool built in Go for bulk-generating and checking domain availability using RDAP. It supports mixing keywords, prefixes/suffixes, and regex patterns, with outputs to stdout, JSON, or CSV. A key USP is the integrated MCP server enabling AI agents like Claude to autonomously brainstorm and verify domains. It solves major pain points such as rate limits, slow performance, and outdated WHOIS parsing. As a 100% free and open-source tool installable via Homebrew, it delivers high value to developers seeking efficient domain discovery.

📈 Market Timing

In 2025-2026, AI agent adoption is surging and RDAP has matured as the standard replacement for legacy WHOIS. Demand for automated, high-speed developer tools is rising amid growing domain saturation and AI workflow integration. The MCP feature aligns perfectly with AI trends while open-source distribution fits community-driven innovation. This is an Excellent Timing.

✅ Feasibility

Technical difficulty is low to medium as it leverages mature Go concurrency and RDAP libraries; already implemented and available via Homebrew. Development and operation costs are minimal for an open-source CLI with no infrastructure overhead. No major supply chain or compliance risks beyond standard open-source licensing. Excellent scalability for local and AI-integrated use. Overall High feasibility.

🎯 Target Market

Main segments: software developers, open-source enthusiasts, domain investors, startup founders, and AI tool users (e.g. Claude operators), primarily tech professionals aged 25-45, globally distributed with concentration in North America, Europe. Estimated market size: niche within developer tools (TAM large, SAM/SOM smaller for domain utilities). Core pain points are inefficient bulk checking and lack of AI automation. Willingness to pay exists for premium support or related services despite current free model.

⚔️ Competition

Low. Direct competitors: 1. dnstwist (github.com/elceef/dnstwist), 2. Instant Domain Search (instantdomainsearch.com), 3. Namelix (namelix.com), 4. Domainr (domainr.com). Advantages: superior speed via concurrency and RDAP, native AI agent integration (MCP), flexible generation rules, multiple output formats, fully free/open-source. Disadvantages: CLI-only (steep learning curve for non-technical users), no built-in registration. Strong differentiation in the AI + CLI niche with low competition pressure.

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