SubNetCalc

SubNetCalc is a Bash script that calculates detailed subnet information based on an IP address in CIDR notation (e.g., 192.168.1.0/24). Using sipcalc, the script provides key information about the subnet, including Network ID, broadcast address, usable host range, total usable hosts, IP class, and whether the IP is public or private.

Features

• Network ID: Displays the Network ID of the subnet.
• Broadcast Address: Shows the broadcast address for the subnet.
• Host Range: Displays the range of usable IP addresses for hosts in the subnet.
• Total Hosts: Calculates the number of usable hosts (excluding Network ID and broadcast address).
• IP Class: Determines if the IP is Class A, B, C, etc.
• Public or Private IP: Indicates if the IP address is in a private or public range.

Requirements

This script requires sipcalc to compute subnet information. You can install sipcalc on Debian-based systems with:

sudo apt-get install sipcalc

Usage

Run the script by providing an IP address in CIDR format as a parameter:

./subnetcalc.sh <IP/CIDR>

Example

./subnetcalc.sh 192.168.1.0/24

Output Example

Network ID      : 192.168.1.0
Broadcast       : 192.168.1.255
Total Hosts     : 254
Host Range      : 192.168.1.1 - 192.168.1.254
IP Class        : Class C
IP Type         : Private