# vacant

> Check domain name availability across any TLD — one name or hundreds at once.
> Free, no signup, no WHOIS rate limits. vacant screens names directly against
> authoritative TLD nameservers (instant DNS-based screening), then confirms the
> free-looking ones against the registry via RDAP in one click.

vacant is a free, open-source domain name availability checker built by [All Tuner Labs](https://alltuner.com).
It runs as a web tool (https://vacant.alltuner.com), a command-line program, and a skill you can drop into an AI coding agent.

## What makes it different

- **Bulk:** paste hundreds of names and check them in one pass.
- **Any TLD:** every gTLD, ccTLD, and new extension — not a popular shortlist.
- **No WHOIS rate limits:** screening goes straight to authoritative TLD nameservers, so it stays fast at scale.
- **Two-step certainty:** instant DNS screening flags candidates, then one click confirms each against the registry via RDAP.
- **No upsell:** no account, no registrar funnel. Open source.

## Use it on the web

Open https://vacant.alltuner.com and type one domain, or toggle bulk mode and paste a list (one per line, up to 500).
Free-looking candidates are confirmed against the registry automatically for small batches, or on a click for large ones.

## Use it from the command line

Same engine, no install required:

- `uvx vacant example.com`
- `bunx @alltuner/vacant example.com`
- `npx -y @alltuner/vacant example.com`

Or install it:

- `brew install alltuner/tap/vacant`
- `uv add vacant`
- `cargo install vacant`

## Use it from an AI coding agent

vacant ships as an [agent skill](https://github.com/alltuner/skills). Drop it into Claude Code or any agent
harness and let the agent brainstorm names, check availability in bulk, and iterate until it lands a free one:

- `npx skills add alltuner/skills --skill vacant`

It also runs as an MCP server (stdio) exposing a `check_domains` tool — point any MCP client at it:

- `uvx --from 'vacant[mcp]' vacant mcp`

## Links

- [Web tool](https://vacant.alltuner.com)
- [vacant on GitHub](https://github.com/alltuner/vacant)
- [vacant on PyPI](https://pypi.org/project/vacant/)
- [Agent skill](https://github.com/alltuner/skills)
- [All Tuner Labs](https://alltuner.com)