How do I get the netmask of any CIDR, e.g.
CIDR=10
> 255.255.0.0
CIDR=24
> 255.255.255.0
CIDR=25
> 255.255.255.128
CIDR=31
> 255.255.255.254
Get netmaske from CIDR
107 Views Asked by MrCalvin At
1
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This will create a byte[4] array with the four netmask octet. You assign your CIDR to the variable
CIDRInt
UPDATE:
I like the idea of calculating the netmask as above, but I ended up creating a "low-tech" class with manual static mappings of
CIDR
<>Netmask
for assumable better performance and two-way-convertion. The class also return the netmask-class (A, B or C) and the amount of covered IP addresses of each netmask. The class is available at github.com