Lightweight /24 network discovery script that reduces noise before deeper scans. Built for repeatable reconnaissance.

#!/bin/bash

# Function to extract network prefix from IP address
get_network_prefix() {
    local ip="$1"
    echo "${ip%.*}"
}

# Get the IP address of the host
ip_address=$(hostname -I | awk '{print $1}')

# Check if an IP address is obtained
if [ -z "$ip_address" ]; then
    echo "Failed to retrieve IP address. Please check your network connection."
    exit 1
fi

# Extract the network prefix
network_prefix=$(get_network_prefix "$ip_address")

echo "Network prefix: $network_prefix"

# Function to perform a ping sweep for a given IP
ping_sweep() {
    local ip="$1"
    ping -c 1 -w 1 "$ip" >/dev/null 2>&1 && echo "$ip"
}

# Loop through 1 to 254 and ping each address
for ip in $(seq 1 254); do
    ping_sweep "$network_prefix.$ip" &
done

# Wait for all background processes to complete
wait