subnet-command

Basic IPv4 subnet calculator developed with C++

Execution

$ ./subnet --help

help called
Usage: subnet [options] network 

Positional arguments:
network         network segment, for example 192.168.1.1/24 [Required]

Optional arguments:
-h --help       show this help message and exit
-l --level      Log level (trace, info, debug, error, critical), default is --level info
--hosts         Required hosts to implement the subnetting
--subnets       Required subnets to implement the subnetting

Usage examples:

$ ./subnet --hosts 120 192.168.1.0/24

[dd-mm-yyyy HH:MM:ss] [info] IP Address: 192.168.1.0/24
[dd-mm-yyyy HH:MM:ss] [info] Mask: 255.255.255.0

[dd-mm-yyyy HH:MM:ss] [info] Total of subnets: 2
[dd-mm-yyyy HH:MM:ss] [info] Hosts per new network: 126
        IPv4 subnet by required hosts results
--------------------------------------------
ID      Network Address         Full mask address       Broadcast
0       192.168.1.0     /25     255.255.255.128         192.168.1.127
1       192.168.1.128   /25     255.255.255.128         192.168.1.255
--------------------------------------------

$ ./subnet --subnets 4 192.168.1.0/24

[dd-mm-yyyy HH:MM:ss] [info] IP Address: 192.168.1.0/24
[dd-mm-yyyy HH:MM:ss] [info] Mask: 255.255.255.0

[dd-mm-yyyy HH:MM:ss] [info] Total of subnets: 4
[dd-mm-yyyy HH:MM:ss] [info] Hosts per new network: 62
        IPv4 subnet by required networks results
--------------------------------------------
ID      Network Address         Full mask address       Broadcast
0       192.168.1.0     /26     255.255.255.192         192.168.1.63
1       192.168.1.64    /26     255.255.255.192         192.168.1.127
2       192.168.1.128   /26     255.255.255.192         192.168.1.191
3       192.168.1.192   /26     255.255.255.192         192.168.1.255
--------------------------------------------

It uses bitwise operations to calculate the new addresses, so it is fast getting results.

$ ./subnet --subnets 1000 172.16.0.0/16

[dd-mm-yyyy HH:MM:ss] [info] IP Address: 172.16.0.0/16
[dd-mm-yyyy HH:MM:ss] [info] Mask: 255.255.0.0

[dd-mm-yyyy HH:MM:ss] [info] Total of subnets: 1024
[dd-mm-yyyy HH:MM:ss] [info] Hosts per new network: 62
	IPv4 subnet by required networks results
--------------------------------------------
ID	Network Address		Full mask address	Broadcast
0	172.16.0.0	/26	255.255.255.192		172.16.0.63
1	172.16.0.64	/26	255.255.255.192		172.16.0.127
2	172.16.0.128	/26	255.255.255.192		172.16.0.191
...
1020	172.16.255.0	/26	255.255.255.192		172.16.255.63
1021	172.16.255.64	/26	255.255.255.192		172.16.255.127
1022	172.16.255.128	/26	255.255.255.192		172.16.255.191
1023	172.16.255.192	/26	255.255.255.192		172.16.255.255
--------------------------------------------

Requirements

If you want to compile it in your system, there are some tools that you need to install before compilation

build-essentials

sudo apt-get install build-essentials
g++ --version

cmake

sudo apt-get install cmake
cmake --version

Compilation

• Clone the subnetting repository

git clone https://github.com/Malandru/subnetting

• Create an empty folder inside the subnetting/ project to generate the executable

mkdir subnetting/build
cd subnetting/build

• Compile the code

cmake ..  # inside subnetting/build/
make