🌐 Network Discovery Script

Overview

This script performs a network discovery scan by pinging all possible IP addresses within a given subnet. It is useful for quickly identifying active hosts in a local network. The user provides the first three octets of an IP address (e.g., 10.0.1), and the script automatically checks all 254 addresses in that range.

How It Works

1. The script accepts the first three octets of the IP address (e.g., 10.0.1) as an argument.
2. It then pings all IP addresses from 10.0.1.0 to 10.0.1.254 (for a /24 network).
3. It checks each IP address by sending a single ping with a short timeout (-w 1).
4. If the host responds (i.e., a "TTL" value is found), the script reports the host as "UP".

Why This Script Is Great:

• Efficiency: The script uses parallel execution, meaning it pings multiple IPs at the same time, making the scan much faster.
• Simple and Lightweight: The script is easy to understand and does not require additional dependencies, making it quick to deploy in any network environment.
• Flexible Input: Users only need to input the first three octets of the subnet (e.g., 10.0.1) — the last octet is automatically handled by the loop.
• Minimal Impact: The script runs with a very low footprint, using basic ping commands and simple shell scripting.

Usage

./net-discover.sh 10.0.1

Note: Don't include the last octet of the IP address; the script will handle it automatically.