Keeping a network monitor permanently visible without losing your screen
Security tooling only works if you look at it. The limiting factor is usually not the tool — it is where the window ends up.
Outbound firewalls · DNS privacy · macOS
Understand every connection leaving your Mac
NetworkMonitor is an independent blog about outbound firewalls, network monitoring and the day-to-day comfort of a locked-down Mac. Deep, practical guides — no signup, no tracking, no product to sell you.
16
in-depth guides
0
trackers on this site
2006–26
of outbound filtering covered
Core benefits
Why outbound visibility is the foundation
Applications on your Mac talk to remote servers constantly. macOS gates the camera, the microphone, the disk and the screen — but never the network. Understanding what leaves your machine is where modern privacy actually starts.
Complete connection visibility
See every outgoing connection in real time — which application, which destination, how much data — with nothing hidden.
Rules based on identity
Control connections by verified application signature, domain, port and protocol — not just by IP address.
DNS-level protection
Block trackers and malicious domains before a connection is even made, with encrypted DNS to keep lookups private.
The blog
Start here
Sixteen guides across two themes: understanding your Mac's network behaviour, and building a workspace comfortable enough that you actually keep watching it.
What the Accessibility permission actually allows on macOS
The dialog says an app wants to control your computer. That is technically true and badly misleading. Here is the real scope.
Setting up a Mac workstation that is both locked down and pleasant to use
Security that makes a machine unpleasant gets switched off within a month. The order of operations matters as much as the choices.
How outbound firewalls changed macOS privacy
Before per-application filtering, a Mac's outgoing traffic was simply unobservable. The shift from trusting software to verifying it took twenty years.
Why network visibility matters more than blocking
Most people install a firewall to block things and end up keeping it for a different reason entirely.
macOS privacy and security tools worth knowing in 2026
Five categories of tool, what each genuinely does, and the overlap people waste money on.
How it works
Outbound filtering in three stages
Real-time interception
Every process opening a connection is caught at the kernel level, before any data leaves the device.
Rule matching
The connection is evaluated against your rules using the application's cryptographic signature, the destination domain, the port and the protocol.
Decision
If no rule applies, you are prompted with clear context, or a learned policy responds automatically to keep the noise down.