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tldx: Open-source CLI tool for bulk domain availability checking via RDAP

Brandon Young

7d ago· 1 min readenProduct

46/100

Doughy

Bagelometer↗

A bagel that needed a few more minutes. And maybe a fact-check.

Score46Typepress releaseSentimentpositive

Summary

tldx is an open-source, blazing-fast CLI tool written in Go that bulk-checks domain availability via RDAP. It allows users to generate and check domain name combinations using keywords, prefixes/suffixes, or regex, outputting results to stdout, JSON, or CSV. It includes an MCP server for AI agent integration (e.g., Claude) and is available via Homebrew, winget, and AUR. The tool is designed to be private, concurrent, and free from rate-limits and legacy WHOIS parsing.

Key quotes

· 3 pulled

I wanted something I could ask: 'give me every combo of get, use + my keyword + .com, .io, .ai and tell me what's free' and just get results.

It's written in Go, fully open source, and available via Homebrew, winget, and AUR.

Say goodbye to rate-limits and legacy whois parsing. 100% Free & Open Source in Go.

Snippet from the RSS feed

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 include

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