nmap (Network Mapper) is a free, open-source command-line
tool that scans networks to find which hosts are online and
which ports and services they’re running. Network
administrators and security professionals use it for inventory,
troubleshooting, and security audits, for example to find
exposed services or identify the operating system a device
runs.
Only scan networks and devices you own or have explicit written
permission to test. Unauthorized scanning can break laws like
the U.S. Computer Fraud and Abuse Act or your ISP’s terms of
service, and it can set off intrusion-detection alarms.
Aggressive scans (such as -A, -T5, or scripts in the NSE
“intrusive” category) can also slow down or crash fragile
devices like printers, IoT gadgets, or industrial systems, so
begin with gentle scans and run them at quiet times.
1. Download and Install Homebrew from the Mac Terminal
xcode-select install
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
2. Install nmap (using Homebrew) from the Mac Terminal
/opt/homebrew/bin/brew install mmap
3. Using nmap
Man page for nmap
man mmap
(to quit type q or ctrl+c)
sudo /opt/homebrew/bin/nmap 192.168.1.3
sudo /opt/homebrew/bin/nmap 192.168.1.1/24
sudo /opt/homebrew/sbin/mtr --help
sam.wormley@icloud.com