NetMonitor: Network Scanner

10 professional network tools. Zero cloud. Zero ads. Zero subscriptions. Everything runs locally on your Mac.

NetMonitor is a complete network monitoring and diagnostics toolkit built for macOS. Scan your network, discover every connected device, trace routes across the globe, and diagnose issues in seconds - all without creating an account or sending a single byte off your machine.

WHO IT'S FOR

- Network admins - Monitor infrastructure and spot rogue devices

- Developers - Debug connectivity, inspect DNS, scan ports

- Homelab enthusiasts - Map your entire network and track every device

NETWORK DASHBOARD

See your entire network at a glance. A live health score rates your connection quality in real time, combining latency, packet loss, and DNS responsiveness into a single number. Monitor gateway reachability, public IP, ISP details, and live connection events - all in one view.

DEVICE DISCOVERY

Find devices other apps miss. NetMonitor's multi-phase scanning engine uses ARP, Bonjour, TCP probes, and reverse DNS to build a complete picture of your network. See IP and MAC addresses, vendor names, open ports, running services, and connection history for every device.

10 BUILT-IN DIAGNOSTIC TOOLS

- Ping - ICMP with TCP fallback, live latency graphs, and packet statistics

- Traceroute - Hop-by-hop path analysis with timing

- GeoTrace - Visual traceroute plotted on a world map

- World Ping - Test reachability from 20+ global nodes at the same time

- Port Scanner - TCP scanning with preset and custom port ranges

- DNS Lookup - Query A, AAAA, MX, NS, TXT, and CNAME records

- Speed Test - Download and upload throughput with peak speed and jitter tracking

- WiFi Heatmap - Walk-around signal survey with floor plan overlay

- WHOIS - Domain registration and ownership lookup

- Bonjour Browser - Discover mDNS services on your network

WIFI HEATMAPPING

Import a floor plan or use freeform mode, then walk around to map signal strength across your space. Identify dead zones and optimise access point placement with real data instead of guesswork.

GEOTRACE

See the physical path your traffic takes. GeoTrace plots each hop on a satellite map so you can visualise routing across cities, countries, and continents.

IPHONE COMPANION

Connect to NetMonitor on your iPhone over your local network via Bonjour. Synchronise devices, run remote diagnostics, and monitor your network from either platform. No cloud relay - communication stays on your LAN.

TIMELINE AND EVENT HISTORY

Every scan, device change, and network event is logged. Scroll back through your network history to spot patterns, track when devices appeared or disappeared, and review past diagnostics.

No data ever leaves your device. No analytics. No tracking. Just tools that work.