Nullgen AI BlockerHow to block Black Forest Labs
How to block Black Forest Labs on every device
Black Forest Labs makes the FLUX image models and serves them through its playground and API. Below: how to block Black Forest Labs in the browser, on phones and tablets, on your home or school network, and on managed devices.
AI blocker suite for browsers, desktop, and mobile
Chrome
Edge
Firefox
Safari
Black Forest Labs
AI image generators
bfl.aiBlocked2 hostnames in the Nullgen catalog
Every entry also covers its subdomains, so the Black Forest Labs app and API are blocked too.
What Black Forest Labs connects to
These are the hostnames Black Forest Labs uses for its website, its apps, and its API. Each entry is matched as a suffix — blocking bfl.ai also blocks every subdomain of it — so the Black Forest Labs app cannot slip through on a hostname that is not listed. Shared hosts that other products need are deliberately left out.
| Hostname | Role |
|---|---|
| bfl.ai | Main website |
| bfl.ml | App, API, or content host |
Block Black Forest Labs in the browser
Free: the Nullgen browser extension
The free extension blocks Black Forest Labs and every other tool in the catalog in Chrome, Edge, Firefox, and Safari. It works on the page itself — no DNS change, no policy — and updates as the catalog grows.
Managed browsers: block the sites by policy
On a school or company fleet, push the hostnames as a browser policy so Black Forest Labs is blocked even when someone uninstalls extensions. These snippets use the official Chrome, Edge, and Firefox policy names and the same hosts listed above.
Chrome and Edge — URLBlocklist
{
"URLBlocklist": [
"bfl.ai",
"bfl.ml"
]
}Firefox — policies.json
{
"policies": {
"WebsiteFilter": {
"Block": [
"*://bfl.ai/*",
"*://*.bfl.ai/*",
"*://bfl.ml/*",
"*://*.bfl.ml/*"
]
}
}
}Chrome and Edge treat a bare hostname as the host plus every subdomain. Firefox needs both the apex and the wildcard pattern.
Need every AI tool in one file, or a .reg or macOS profile?
Open the free policy generatorBlock the Black Forest Labs app on phones and tablets
Nullgen mobile app
The Nullgen app blocks Black Forest Labs and 100+ other AI apps and sites on the whole device with an on-device filter — the app, the website, and the API, on any network, with no DNS server to run. Included with Nullgen Pro.
Without Nullgen: Screen Time on iPhone and iPad
- 1Open Settings → Screen Time → Content & Privacy Restrictions and turn restrictions on. This covers Black Forest Labs in Safari and in apps that use Apple’s web filter.
- 2Under Web Content, choose Limit Adult Websites — the setting that lets you deny bfl.ai by name.
- 3Under Never Allow, add bfl.ai. Safari and apps that use Apple’s web filter will refuse it.
- 4To keep the Black Forest Labs app off the device entirely, delete it and set Installing Apps to Don’t Allow, or use Ask to Buy on a child’s Apple Account.
Without Nullgen: Family Link on Android
- 1Open Family Link, choose the child, then Controls → Content restrictions → Google Chrome — where Black Forest Labs can be blocked by site.
- 2Choose Only allow approved sites, or add bfl.ai under Blocked sites.
- 3Under Controls → App limits, block the Black Forest Labs app, or require approval for new installs from Google Play.
Block Black Forest Labs on your home or school network
A DNS blocker such as Pi-hole, AdGuard Home, NextDNS, or pfBlockerNG blocks Black Forest Labs for every device on the network — laptops, phones, consoles, and the Black Forest Labs app — without installing anything on them. Subscribe to the Black Forest Labs file from the public blocklist, or paste the rules directly.
Subscribe to the Black Forest Labs list
AdGuard Home, uBlock Origin, and Brave rules
||bfl.ai^
||bfl.ml^DNS blocking cannot see inside a VPN or a phone on mobile data. For a block that follows the device, use the Nullgen apps or an MDM profile.
Block Black Forest Labs on managed devices
Schools and companies can block Black Forest Labs on every managed iPhone, iPad, laptop, and Chromebook from the MDM they already run — Intune, Jamf, Kandji, or Google Workspace — with per-person policies and an approval flow for legitimate use. Nullgen Pro provides the profiles and the dashboard; these guides walk through the setup.
Questions about blocking Black Forest Labs
Does the free Nullgen extension block Black Forest Labs?
Yes. The free extension blocks prompts on Black Forest Labs and every other AI tool in the catalog in Chrome, Edge, Firefox, and Safari. It works on the page itself, so it needs no policy and no DNS change.
Will blocking Black Forest Labs break other websites?
No. Every hostname on this page belongs to Black Forest Labs alone. Shared websites that other products depend on are never on the list — which is also why AI features built into those products stay reachable.
Can someone get around a Black Forest Labs block?
A browser-only block can be bypassed with another browser or the Black Forest Labs app, and a network block can be bypassed with a VPN or a phone on mobile data. A block on the device itself — the Nullgen apps, Screen Time, or an MDM profile — follows the device wherever it goes.
Does this block the Black Forest Labs app, not just the website?
A DNS or device-level block does. The app talks to the same hostnames listed above, and every entry covers its subdomains, so the app cannot slip through on a hostname that is not listed. A browser policy or extension only covers the browser.
What happens when Black Forest Labs adds a new hostname?
The catalog is updated as vendors change, and the Nullgen apps, the extension, and the public blocklist all read from it, so a new hostname reaches every device without anyone editing a list by hand.
Block Black Forest Labs today
Start with the free browser extension. Add Nullgen Pro when you need the Black Forest Labs app blocked on phones, tablets, and desktops, with approvals for the people who really need it.