A tool to speed up subnet calculation, with additional features to help in networking.
$ subnet --help
Subnet Calculator v.0.8
Bash script to assist subnetting process
Usage: subnet [options]
Options:
--help Print this help page
-m, --mode Change mode of the script to run
-i, --ip Provide the IP address
-c, --cidr Provide the CIDR
-n, --netmask Provide the Netmask
-s, --subnets Expected number of subnets
-h, --hosts Expected number of available hosts per subnet
-t, --try Number of subnets' detail to print
Modes:
1 - Get network information from a pair of IP address and its CIDR notation e.g. 10.0.0.0/16
2 - Perform subnet calculation for for the amount of required hosts per subnet or required subnets
3 - Check the type and class of an IP address
Get network information from a pair of IP address and its CIDR notation e.g. 10.0.0.0/16
$ subnet -m=1 -i=192.168.141.111 -c=28
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| Network Address | CIDR Notation | Subnet Mask | Useable Host/Subnet | Host Address Range | Broadcast Address |
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| 192.168.141.96 | 28 | 255.255.255.240 | 14 | 192.168.141.97 - 192.168.141.110 | 192.168.141.111 |
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Perform subnet calculation for for the amount of required hosts per subnet or required subnets
$ subnet -m=2 -i=192.168.141.0 -s=2
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| CIDR | IP Class | Type | Subnet Amount | Total Available Hosts | Network Address List |
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| 25 | C | subnet | 2 | 252 | See below |
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Subnet Details:
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| Subnet ID | Network Address | CIDR Notation | Subnet Mask | Useable Host/Subnet | Host Address Range | Broadcast Address |
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| 1 | 192.168.141.0 | 25 | 255.255.255.128 | 126 | 192.168.141.1 - 192.168.141.126 | 192.168.141.127 |
| 2 | 192.168.141.128 | 25 | 255.255.255.128 | 126 | 192.168.141.129 - 192.168.141.254 | 192.168.141.255 |
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$ subnet -m=2 -i=192.168.141.0 -h=50 -t=all
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| CIDR | IP Class | Type | Subnet Amount | Total Available Hosts | Network Address List |
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| 26 | C | subnet | 4 | 248 | See below |
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Subnet Details:
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| Subnet ID | Network Address | CIDR Notation | Subnet Mask | Useable Host/Subnet | Host Address Range | Broadcast Address |
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| 1 | 192.168.141.0 | 26 | 255.255.255.192 | 62 | 192.168.141.1 - 192.168.141.62 | 192.168.141.63 |
| 2 | 192.168.141.64 | 26 | 255.255.255.192 | 62 | 192.168.141.65 - 192.168.141.126 | 192.168.141.127 |
| 3 | 192.168.141.128 | 26 | 255.255.255.192 | 62 | 192.168.141.129 - 192.168.141.190 | 192.168.141.191 |
| 4 | 192.168.141.192 | 26 | 255.255.255.192 | 62 | 192.168.141.193 - 192.168.141.254 | 192.168.141.255 |
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By default, if -t or --try parameter were not specified, the script will only provide two (2) entries in the subnet details table in order to save computing power.
Check the type and class of an IP address
$ subnet -m=3 -i=10.11.12.13
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| IP Address | Class | Type |
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| 10.11.12.13 | A | Private |
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