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Jack-Benny Persson
2020-05-02 15:23:22 +02:00
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# subnetcalc #
A simple subnet calculator written in C, statically compiled, and
then Dockerized. The *Dockerized* version was created as a demonstration
on how to create really small Docker images from scratch.
![Docker Image Size (latest by date)](https://img.shields.io/docker/image-size/jackbenny/subnetcalc?sort=date)
![Docker Pulls](https://img.shields.io/docker/pulls/jackbenny/subnetcalc)
![Docker Stars](https://img.shields.io/docker/stars/jackbenny/subnetcalc)
![Docker Cloud Automated build](https://img.shields.io/docker/cloud/automated/jackbenny/subnetcalc)
![Docker Cloud Build Status](https://img.shields.io/docker/cloud/build/jackbenny/subnetcalc)
## Manual build
If you would like to build it yourself, instead of running the
pre-compiled image from Docker Hub, simple type `make`. This will
create a image called *subnetcalc*. If you get a *"is up to date"* message,
instead run `make --always-make`.
## Usage
Run it (remove jackbenny/ if you would like to run it from your local build)
and enter the subnet mask in slash notation -- but without the slash.
For example enter 24 for a 24-bit subnet mask and the
program will output the total number of addresses in the range aswell
as the total number of usable addresses for hosts.
$> docker run -it --rm jackbenny/subnetcalc
Enter netmask in slash-notation without the slash: 24
Netmask bit: 24
256 total addresses
254 usable addresses for hosts