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Powerful CLI toolkit for IP networking calculations, subnet/supernet planning, and CIDR address management. Master IPv4 subnetting, VLSM/FLSM calculations, and route aggregation with ease. Simplifying complex network tasks for engineers, administrators, and students.

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nazdridoy/SubnetCalculator

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Powerful CLI toolkit for IP networking calculations, subnet/supernet planning, and CIDR address management. Master IPv4 subnetting, VLSM/FLSM calculations, and route aggregation with ease. Simplifying complex network tasks for engineers, administrators, and students.

License: MITPython 3.6+Platform

Features

  • Network Information: Display detailed information about any IP network
  • VLSM Calculation: Create optimally-sized subnets based on specific host requirements
  • FLSM Calculation: Create equal-sized subnets based on either:
    • Number of required subnets
    • Specific prefix length
  • Notation Conversion: Easily convert between:
    • CIDR notation (e.g., /24)
    • Subnet masks (e.g., 255.255.255.0)
    • Wildcard masks (e.g., 0.0.0.255)
  • IP Address Utilities: Tools for IP address analysis:
    • IP validation and classification
    • Check if an IP is within a subnet
    • Analyze IP address ranges
  • Supernetting/CIDR Aggregation: Efficient route summarization:
    • Aggregate multiple networks into optimal CIDR blocks
    • Find the smallest common supernet
    • Analyze common network prefixes
  • Interactive Mode: User-friendly interactive input with command history and editing
  • Command-line Mode: Scriptable operation for automation

SubnetCalculator screenshot showing example output of subnet calculation results

Installation

Clone the repository

git clone https://github.com/nazdridoy/SubnetCalculator.gitcd SubnetCalculator

Make the script executable

chmod +x subcalc

Usage

Network Summary

Display detailed information about a network:

./subcalc --network 192.168.0.0/24

FLSM Subnet Calculation

Create equal-sized subnets in two ways:

  1. By number of subnets:
./subcalc --network 192.168.0.0/24 --flsm 8
  1. By specific prefix length:
./subcalc --network 192.168.0.0/24 --flsm /28

VLSM Subnet Calculation

Create optimally-sized subnets based on host requirements:

./subcalc --network 192.168.0.0/24 --vlsm 50 30 10 5

Interactive Mode

Run the tool interactively:

./subcalc --flsm# For FLSM calculation./subcalc --vlsm# For VLSM calculation

Notation Conversion

Convert between CIDR, subnet mask, and wildcard mask notations:

./subcalc --convert /24# Convert from CIDR notation./subcalc --convert 255.255.255.0# Convert from subnet mask notation./subcalc --convert 0.0.0.255# Convert from wildcard mask notation./subcalc --convert# Run in interactive mode

IP Address Utilities

Validate an IP Address

Validate an IP address and display information about it:

./subcalc --validate 192.168.1.1# Validate a specific IP./subcalc --validate# Run in interactive mode

Check if an IP is within a Network

Check if an IP address belongs to a specified network:

./subcalc --check-ip 192.168.1.5 192.168.1.0/24# Check IP in network./subcalc --check-ip 10.0.0.1# Prompt for network./subcalc --check-ip# Fully interactive mode

Analyze IP Address Range

Calculate information about an IP address range:

./subcalc --range 192.168.1.10 192.168.1.20# Analyze specific range./subcalc --range 10.0.0.1# Prompt for end IP./subcalc --range# Fully interactive mode

Supernetting/CIDR Aggregation

Aggregate multiple subnets into optimal summary routes:

# Find efficient summary routes for multiple networks./subcalc --supernet 192.168.1.0/24 192.168.2.0/24 192.168.3.0/24# Run in interactive mode./subcalc --supernet

Command-line Arguments

usage: subcalc [-h] [--network NETWORK] [--vlsm [VLSM ...]] [--flsm [FLSM]] [--convert [CONVERT]]               [--validate [VALIDATE]] [--check-ip [CHECK_IP ...]] [--range [RANGE ...]]               [--supernet [SUPERNET ...]]Subnet Calculator Tool - Calculate and display subnet informationoptions:  -h, --help            show this help message and exit  --network NETWORK     Base network address in CIDR notation (e.g., 192.168.0.0/24)  --vlsm [VLSM ...]     Run Variable Length Subnet Mask calculator with specified host requirements (e.g., --vlsm 20 40 80)  --flsm [FLSM]         Run Fixed Length Subnet Mask calculator with either number of subnets (e.g., --flsm 4) or target prefix length                        (e.g., --flsm /28)  --convert [CONVERT]   Convert between CIDR notation, subnet masks, and wildcard masks (e.g., --convert /24 or --convert                        255.255.255.0)  --validate [VALIDATE]                        Validate an IP address and show its properties (e.g., --validate 192.168.1.1)  --check-ip [CHECK_IP ...]                        Check if an IP address is in a network (e.g., --check-ip 192.168.1.5 192.168.1.0/24)  --range [RANGE ...]   Analyze an IP address range (e.g., --range 192.168.1.10 192.168.1.20)  --supernet [SUPERNET ...]                        Find optimal summary routes for multiple subnets (e.g., --supernet 192.168.1.0/24 192.168.2.0/24)Examples:  ./subcalc --network 192.168.0.0/24                    # Display network summary  ./subcalc --network 192.168.0.0/24 --flsm 16          # Create 16 equal-sized subnets  ./subcalc --network 192.168.0.0/24 --flsm /28         # Create subnets with prefix /28  ./subcalc --network 192.168.0.0/24 --vlsm 20 40 50    # Create subnets with specified host capacities  ./subcalc --flsm                                      # Run FLSM in interactive mode  ./subcalc --vlsm                                      # Run VLSM in interactive mode  ./subcalc --convert /24                               # Convert between CIDR, subnet mask, and wildcard mask  ./subcalc --convert 255.255.255.0                     # Convert between notations using subnet mask  ./subcalc --convert                                   # Run conversion tool in interactive mode  ./subcalc --validate 192.168.1.5                      # Validate an IP address and display information  ./subcalc --check-ip 192.168.1.5 192.168.1.0/24       # Check if an IP address is in a network  ./subcalc --range 192.168.1.10 192.168.1.20           # Analyze an IP address range  ./subcalc --supernet 192.168.1.0/24 192.168.2.0/24    # Find optimal summary routes for multiple subnets  ./subcalc --supernet                                  # Run supernetting tool in interactive mode

Example Outputs

Network Summary

Network Summary for 192.168.0.0/24:Network Address:     192.168.0.0Broadcast Address:   192.168.0.255Netmask:             255.255.255.0Prefix Length:       /24Number of Addresses: 256Usable Hosts:        254First Usable Host:   192.168.0.1Last Usable Host:    192.168.0.254

FLSM Output

FLSM Summary:Base Network:         192.168.0.0/24Subnet Bits:          2New Prefix Length:    /26Subnet Mask:          255.255.255.192Hosts per Subnet:     62Requested Subnets:    4Actual Subnets:       4Unused Subnets:       0+----------+------------------+-----------------+---------------+---------------+---------------+---------------+-------+| Subnet   | CIDR Notation    | Subnet Mask     | Network ID    | Broadcast ID  | First Host IP | Last Host IP  | Hosts |+----------+------------------+-----------------+---------------+---------------+---------------+---------------+-------+| Subnet 1 | 192.168.0.0/26   | 255.255.255.192 | 192.168.0.0   | 192.168.0.63  | 192.168.0.1   | 192.168.0.62  | 62    |+----------+------------------+-----------------+---------------+---------------+---------------+---------------+-------+| Subnet 2 | 192.168.0.64/26  | 255.255.255.192 | 192.168.0.64  | 192.168.0.127 | 192.168.0.65  | 192.168.0.126 | 62    |+----------+------------------+-----------------+---------------+---------------+---------------+---------------+-------+| Subnet 3 | 192.168.0.128/26 | 255.255.255.192 | 192.168.0.128 | 192.168.0.191 | 192.168.0.129 | 192.168.0.190 | 62    |+----------+------------------+-----------------+---------------+---------------+---------------+---------------+-------+| Subnet 4 | 192.168.0.192/26 | 255.255.255.192 | 192.168.0.192 | 192.168.0.255 | 192.168.0.193 | 192.168.0.254 | 62    |+----------+------------------+-----------------+---------------+---------------+---------------+---------------+-------+...

VLSM Output

+------------------+-----------------+---------------+---------------+---------------+---------------+--------------+-------------+| Subnet           | Subnet Mask     | Network ID    | Broadcast ID  | First Host IP | Last Host IP  | Needed Hosts | Total Hosts |+------------------+-----------------+---------------+---------------+---------------+---------------+--------------+-------------+| 192.168.0.0/25   | 255.255.255.128 | 192.168.0.0   | 192.168.0.127 | 192.168.0.1   | 192.168.0.126 | 100          | 126         |+------------------+-----------------+---------------+---------------+---------------+---------------+--------------+-------------+| 192.168.0.128/26 | 255.255.255.192 | 192.168.0.128 | 192.168.0.191 | 192.168.0.129 | 192.168.0.190 | 50           | 62          |+------------------+-----------------+---------------+---------------+---------------+---------------+--------------+-------------+| 192.168.0.192/27 | 255.255.255.224 | 192.168.0.192 | 192.168.0.223 | 192.168.0.193 | 192.168.0.222 | 25           | 30          |+------------------+-----------------+---------------+---------------+---------------+---------------+--------------+-------------+| 192.168.0.224/28 | 255.255.255.240 | 192.168.0.224 | 192.168.0.239 | 192.168.0.225 | 192.168.0.238 | 10           | 14          |+------------------+-----------------+---------------+---------------+---------------+---------------+--------------+-------------+...

Notation Conversion Output

Notation Conversion Results:CIDR Notation:      /24Subnet Mask:        255.255.255.0Wildcard Mask:      0.0.0.255Binary Mask:        11111111.11111111.11111111.00000000Hex Mask:           FFFFFF00Network Bits:       24Host Bits:          8Max Addresses:      256Usable Hosts:       254

IP Validation Output

IP Address Analysis Results:IP Address:        192.168.1.5Valid IPv4:         TrueAddress Type:      Private AddressBinary Form:       11000000.10101000.00000001.00000101Hex Form:          C0A80105Decimal Form:      3232235781Octet Values:      192 | 168 | 1 | 5Address Class:     Class C (192-223)Network Info:Address is in the private range 192.168.0.0/16 (RFC1918)Address is unicast (host to host communication)

IP Network Membership Check Output

IP Network Membership Check:IP Address:         192.168.1.5Network:            192.168.1.0/24Is IP in Network:   TrueNetwork Details:Network Address:    192.168.1.0Broadcast Address:  192.168.1.255Subnet Mask:        255.255.255.0Prefix Length:      /24Total Addresses:    256Usable Hosts:       254First Usable Host:  192.168.1.1Last Usable Host:   192.168.1.254Host Position Details:Position in Network: 5 (starting from 0)Position from End:   250 (to broadcast)

IP Range Analysis Output

IP Range Analysis:Start IP:           192.168.1.10End IP:             192.168.1.20Total Addresses:    11Optimal CIDR Block Representation:  Block 1: 192.168.1.10/31 (2 addresses)  Block 2: 192.168.1.12/30 (4 addresses)  Block 3: 192.168.1.16/30 (4 addresses)  Block 4: 192.168.1.20/32 (1 addresses)

Supernetting Output

Supernetting Results:Input Networks (3):  1. 192.168.1.0/24 (256 addresses)     Binary: 11000000.10101000.00000001.00000000     Prefix: 11111111.11111111.11111111.00000000  2. 192.168.2.0/24 (256 addresses)     Binary: 11000000.10101000.00000010.00000000     Prefix: 11111111.11111111.11111111.00000000  3. 192.168.3.0/24 (256 addresses)     Binary: 11000000.10101000.00000011.00000000     Prefix: 11111111.11111111.11111111.000000001. Efficient Aggregation (Multiple Blocks)   Result: 2 CIDR block(s)     Block 1: 192.168.1.0/24 (256 addresses)            Binary: 11000000.10101000.00000001.00000000            Prefix: 11111111.11111111.11111111.00000000     Block 2: 192.168.2.0/23 (512 addresses)            Binary: 11000000.10101000.0000001|0.00000000            Prefix: 11111111.11111111.11111110.00000000   Total Addresses: 7682. Single Supernet (Summary Route)   Result: 192.168.0.0/22 (1024 addresses)          Binary: 11000000.10101000.000000|00.00000000          Prefix: 11111111.11111111.11111100.00000000   Address Waste: 256 addresses (25.0%)3. Common Prefix Analysis   Common Prefix: 22 bits   Common Network: 192.168.0.0/22   Prefix Mask:  NNNNNNNN.NNNNNNNN.NNNNNNHH.HHHHHHHH                 N = Network bits (match), H = Host bits (vary)   Binary Form:  11000000.10101000.00000000.00000000   Address Range: 192.168.0.0 - 192.168.3.255   Total Range:   1024 addresses

Author

nazdridoy

Contributing

Contributions, issues, and feature requests are welcome!

License

This project is licensed under the MIT License. See theLICENSE file for details.

About

Powerful CLI toolkit for IP networking calculations, subnet/supernet planning, and CIDR address management. Master IPv4 subnetting, VLSM/FLSM calculations, and route aggregation with ease. Simplifying complex network tasks for engineers, administrators, and students.

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