software catalog

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+---
+title: "Nmap"
+category: "Networking and remote access"
+tagline: "Discover devices on a network and see which ports and services they expose."
+source: "pacman"
+package: "nmap"
+command: "nmap"
+website: "https://nmap.org/"
+code: "https://github.com/nmap/nmap"
+---
+
+## What it is
+
+Nmap is a network scanner. It finds which hosts are up on a network, which ports they have open, and often which services and versions are behind them. Administrators use it to take inventory and to check that a firewall exposes only what it should.
+
+```
+nmap -sn 192.168.1.0/24     # list the devices on your LAN
+```
+
+## Why it's here
+
+- **Know your network.** Find every device on your LAN and what it's running.
+- **Check your firewall.** Scan your own machines from another one to confirm what's reachable.
+
+## On CoreDesktop
+
+Nmap is installed from pacman. Type `nmap` in a terminal; some scan types need `sudo`. Only scan networks you own or have permission to test. `update` keeps Nmap current with the pacman packages.