ip-scheme-helper

Generate a list of sub-networks from a starting network. Useful for creating a subnet allocation spreadsheet.

Usage

usage: main.py [-h] [-m MAX_PREFIX] [-c INDENT_CHAR] network

Subnet a network.

positional arguments:
  network               Network to subnet.

optional arguments:
  -h, --help            show this help message and exit
  -m MAX_PREFIX, --max-prefix MAX_PREFIX
                        Maximum prefix length.
  -c INDENT_CHAR, --indent-char INDENT_CHAR
                        Characters to use for indentation.

Examples

Subnet a /16 down to /20s:

    python3 main.py 192.168.0.0/16 -m 20
    192.168.0.0/16
     192.168.0.0/17
      192.168.0.0/18
       192.168.0.0/19
        192.168.0.0/20
        192.168.16.0/20
       192.168.32.0/19
        192.168.32.0/20
        192.168.48.0/20
      192.168.64.0/18
       192.168.64.0/19
        192.168.64.0/20
        192.168.80.0/20
       192.168.96.0/19
        192.168.96.0/20
        192.168.112.0/20
     192.168.128.0/17
      192.168.128.0/18
       192.168.128.0/19
        192.168.128.0/20
        192.168.144.0/20
       192.168.160.0/19
        192.168.160.0/20
        192.168.176.0/20
      192.168.192.0/18
       192.168.192.0/19
        192.168.192.0/20
        192.168.208.0/20
       192.168.224.0/19
        192.168.224.0/20
        192.168.240.0/20

Subnet a /12 down to /16 as a csv:

    python3 main.py 172.16.0.0/12 -m 16 -c ","
    172.16.0.0/12
    ,172.16.0.0/13
    ,,172.16.0.0/14
    ,,,172.16.0.0/15
    ,,,,172.16.0.0/16
    ,,,,172.17.0.0/16
    ,,,172.18.0.0/15
    ,,,,172.18.0.0/16
    ,,,,172.19.0.0/16
    ,,172.20.0.0/14
    ,,,172.20.0.0/15
    ,,,,172.20.0.0/16
    ,,,,172.21.0.0/16
    ,,,172.22.0.0/15
    ,,,,172.22.0.0/16
    ,,,,172.23.0.0/16
    ,172.24.0.0/13
    ,,172.24.0.0/14
    ,,,172.24.0.0/15
    ,,,,172.24.0.0/16
    ,,,,172.25.0.0/16
    ,,,172.26.0.0/15
    ,,,,172.26.0.0/16
    ,,,,172.27.0.0/16
    ,,172.28.0.0/14
    ,,,172.28.0.0/15
    ,,,,172.28.0.0/16
    ,,,,172.29.0.0/16
    ,,,172.30.0.0/15
    ,,,,172.30.0.0/16
    ,,,,172.31.0.0/16