mirror of
https://github.com/kernelkit/infix.git
synced 2026-07-26 18:53:01 +02:00
63 lines
2.4 KiB
Markdown
63 lines
2.4 KiB
Markdown
# Network Calculator
|
|
|
|
```
|
|
netcalc <ADDRESS/LEN | NETWORK NETMASK> [split <1-32 | 64-128>]
|
|
```
|
|
|
|
## Description
|
|
|
|
`netcalc` is a network calculator that takes an IP address and a subnet
|
|
mask, or an IP address and prefix mask in CIDR notation, and then returns
|
|
information about the subnet. Both IPv4 and IPv6 is supported.
|
|
|
|
A subnet can be entered in two ways:
|
|
|
|
- `192.168.2.0 255.255.255.0`: traditional IPv4 'address netmask' style
|
|
- `192.168.2.0/24`: modern prefix length, same also for IPv6
|
|
|
|
An optional `split LEN` can be given as argument, the new length value
|
|
must be bigger than the current prefix length. See example below.
|
|
|
|
|
|
## Examples
|
|
|
|
Its most commonly used features are to understand how many addresses an
|
|
IP subnet has, what the broadcast address is, first and last *usable*
|
|
address.
|
|
|
|
```
|
|
admin@example:/> netcalc 192.168.2.0/24
|
|
Address : 192.168.2.0 11000000.10101000.00000010. 00000000
|
|
Netmask : 255.255.255.0 = 24 11111111.11111111.11111111. 00000000
|
|
Wildcard : 0.0.0.255 00000000.00000000.00000000. 11111111
|
|
=>
|
|
Network : 192.168.2.0/24 11000000.10101000.00000010. 00000000
|
|
HostMin : 192.168.2.1 11000000.10101000.00000010. 00000001
|
|
HostMax : 192.168.2.254 11000000.10101000.00000010. 11111110
|
|
Broadcast: 192.168.2.255 11000000.10101000.00000010. 11111111
|
|
Hosts/Net: 254 Class C, Private network (RFC1918)
|
|
```
|
|
|
|
Another common use-case is for IP subnetting, i.e., using only as many
|
|
addresses for an IP subnet as needed. Example, to split the above /24
|
|
in four:
|
|
|
|
```
|
|
admin@example:/> netcalc 192.168.2.0/24 split 26
|
|
Address : 192.168.2.0 11000000.10101000.00000010. 00000000
|
|
Netmask : 255.255.255.0 = 24 11111111.11111111.11111111. 00000000
|
|
Wildcard : 0.0.0.255 00000000.00000000.00000000. 11111111
|
|
=>
|
|
Network : 192.168.2.0/24 11000000.10101000.00000010. 00000000
|
|
HostMin : 192.168.2.1 11000000.10101000.00000010. 00000001
|
|
HostMax : 192.168.2.254 11000000.10101000.00000010. 11111110
|
|
Broadcast: 192.168.2.255 11000000.10101000.00000010. 11111111
|
|
Hosts/Net: 254 Class C, Private network (RFC1918)
|
|
|
|
[Split network/26]
|
|
Network : 192.168.2.0 - 192.168.2.63 Netmask : 255.255.255.192
|
|
Network : 192.168.2.64 - 192.168.2.127 Netmask : 255.255.255.192
|
|
Network : 192.168.2.128 - 192.168.2.191 Netmask : 255.255.255.192
|
|
Network : 192.168.2.192 - 192.168.2.255 Netmask : 255.255.255.192
|
|
```
|