33 lines
1.4 KiB
Markdown
33 lines
1.4 KiB
Markdown
# subnetcalc #
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A simple subnet calculator written in C, statically compiled, and
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then Dockerized. The *Dockerized* version was created as a demonstration
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on how to create really small Docker images from scratch.
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## Manual build
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If you would like to build it yourself, instead of running the
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pre-compiled image from Docker Hub, simple type `make`. This will
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create a image called *subnetcalc*. If you get a *"is up to date"* message,
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instead run `make --always-make`.
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## Usage
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Run it (remove jackbenny/ if you would like to run it from your local build)
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and enter the subnet mask in slash notation -- but without the slash.
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For example enter 24 for a 24-bit subnet mask and the
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program will output the total number of addresses in the range aswell
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as the total number of usable addresses for hosts.
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$> docker run -it --rm jackbenny/subnetcalc
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Enter netmask in slash-notation without the slash: 24
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Netmask bit: 24
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256 total addresses
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254 usable addresses for hosts
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