# Block an app’s internet access on Mac, or just one company or domain

> Block an app from the internet entirely on your Mac, or leave it working while cutting off just one company or domain it talks to.

FireAI Docs (HisnLabs) · Tutorial · Available since FireAI 0.1.0
Canonical: https://hisnlabs.com/fireai/en/docs/block-an-app-or-a-company

**Where in FireAI:** Rules, or the Ask FireAI composer

Cut off exactly what you mean to — the whole app, or just one company it talks to.

## The fastest way: Ask FireAI

1. Open Home or the menu bar, and type into Ask FireAI.
2. To block an app entirely: “block Slack” (or your app’s name).
3. To block one company or domain for one app: “never let Slack talk to Datadog”, or name a domain directly, e.g. “block Teams from reaching doubleclick.net”.
4. FireAI shows a preview of exactly what it will change — click Apply, or Cancel if it got it wrong.

## The precise way: Rules

1. Open Rules and click Add rule.
2. Pick Block (“Stop the connection”).
3. For Which app?, choose the app. To block it completely, set Which website or server? to Anywhere on the internet.
4. To only cut off one company or domain, set Which website or server? to “A website and all its subdomains” and type the domain, or “One website” for a single host.
5. Choose Always or Until I restart my Mac, then save.

> **Note:** You can also right-click any connection in Activity or on the World map for Deny host, Block IP for all apps, or Block this app everywhere, without opening the Rules page at all. For every option a rule can have, see [Rules](https://hisnlabs.com/fireai/en/docs/per-app-rules).

## Read next

- [Mac firewall rules: by app, website, domain, IP or range](https://hisnlabs.com/fireai/en/docs/per-app-rules.md)
- [Use Ask FireAI in plain language](https://hisnlabs.com/fireai/en/docs/use-ask-fireai-in-plain-language.md)
- [Import and export your rules](https://hisnlabs.com/fireai/en/docs/import-export-rules.md)

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