TL;DR: A CLI Tool to Find Available Domains in Seconds

Finding the perfect domain name is a pain. You brainstorm something clever, only to find it’s already taken—along with every variation you can think of. Enter TLDX, an open-source CLI tool that checks domain availability across hundreds of TLDs (like .com, .dev, .io) with a single command.

What It Does

TLDX is a Go-based tool that queries domain registries via RDAP (a modern alternative to WHOIS) to check availability. Instead of manually searching registrars or dealing with rate limits, you can:

• Check a name across dozens of TLDs at once
• Filter by categories (e.g., tech, finance, geek)
• Get clean, color-coded results in your terminal

Why It’s Cool

• No API keys needed: It uses public RDAP endpoints.
• Preset TLD groups: Need a domain for a side project? Run tldx search myapp --category tech to check .dev, .io, .tech, etc.
• Retry logic: Automatically handles rate limits and timeouts.
• Active development: Recent updates added TLD categories like health_wellness and real_estate.

How to Try It

1. Install via Homebrew (macOS/Linux):

   brew install brandonyoungdev/tap/tldx
   

2. Or grab a binary from the releases page.
3. Run a search:

   tldx search youridea --category popular
   

Final Thoughts

As someone who’s wasted hours on domain hunts, TLDX feels like a cheat code. It’s not a full registrar (you’ll still need to buy the domain elsewhere), but it cuts the research time to seconds. The CLI is snappy, and the open-source nature means you can tweak it for niche TLDs. If you’re naming anything—a startup, a blog, or a weird passion project—give this a shot.

Repo: github.com/brandonyoungdev/tldx
More details: brandonyoung.dev/blog/introducing-tldx