Finding Given IP Address in Subnetwork

Subnetting In CIDR Notation

For a description of CIDR notation, and how to find the upper and lower IP range from a given CIDR, see Subnetting in CIDR Notation.

Set Up Instructions

• git pull git@github.com:MattCrook/CIDR-python-script.git
• cd CIDR-python-script
• I used a virtual environment to run this program and install dependencies, this is not needed to run the program, but if you want to, to do so run:
  • python -m venv venv
  • source ./venv/bin/acitvate
  • pip install -r requirements.txt
• To run program, execute on the CLI:
  • chmod +x execute.sh - to make shell command executable.
  • To run:
    • ./execute.sh

To deactivate virtual env, simply run deactivate.

Sample IPs To Test

You can follow the prompt in the program and try your own IP, or try one of the following:

• 68.52.38.81
• 50.38.30.81
• I took a random IPv4 from the list at the endpoint provided, (14.102.172.0/22) , and manually backwards engineered it to find out the IP range. Doing this meant that any IP in the range I found should result in a PASS.
  • The range I found was:
    • 13.101.172.1
    • 13.101.175.254
  • As examples, a couple failing IPs are:
    • 192.168.1.1
    • 192.168.4.12
    • 192.168.4.0
    • Or you can try just typing any random combination of numbers...(you might get lucky and find one that passes!)
      • I tried 60.80.30.10

Tests

To run the tests, run the following command in the terminal.

python -m unittest tests/test_ip_in_subnetwork.py -b

Functions

For a more in depth description of the logic used inside the functions, see here