Subnet Divider is a bash script that helps you divide IP ranges into smaller-sized subnets. This script accepts either an IP range or a file containing multiple IP ranges as input and creates a list of mutually exclusive subnets based on the user-specified subnet size. It supports IPv4 with CIDR range notation.

• Divides IP ranges into subnets
• Supports both single IP ranges and an input file containing IP ranges split by new lines
• User-specified subnet size
• Outputs subnets into a file
• Combines previous outputs by removing duplicate ranges and sorting them all together
• [Optional] Split the output file into multiple files based on a user-specified maximum number of lines per file

1. Clone the repository:

git clone https://github.com/rahgozar94725/Subnet-Divider.git

2. Navigate to the repository directory:

cd Subnet-Divider

3. Make the script executable:

chmod +x subnet-divider.sh

./subnet-divider.sh -i <IP_RANGE_OR_FILE> [--output <OUTPUT_FILE>] [--subnet <SUBNET_BITS>] [--lines <MAX_LINES>]

• -i <IP_RANGE_OR_FILE>, --input <IP_RANGE_OR_FILE>: IP range or a file containing IP ranges.
• -o <OUTPUT_FILE>, --output <OUTPUT_FILE> (optional): The output file name [Default: Based on input file name]
• -s <SUBNET_BITS>, --subnet <SUBNET_BITS> (optional): Target subnet size in bits. [Default: 24]
• -l <MAX_LINES>, --lines <MAX_LINES> (optional): Maximum lines per file for splitting the output. [Default: No splitting]

Divide a single IP range:

./subnet-divider.sh -i 192.168.0.0/16

Extract IP ranges from a file, designate an output file, specify the desired subnet size, and divide the resulting output into multiple files, each containing 100 lines:

./subnet-divider.sh --input ip_ranges.txt --output output.txt --subnet 16 --lines 100

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