How to get netmask?

[ViniScardoso]

Hi, I'm trying to get the ipv4 and ipv6 netmasks but the only method that I found was "getSubnetMasks" but it returns a Short value. Does anyone know how to properly get this informations?

[dbwiddis]

Hey @ViniScardoso ... the netmasks are between 0 and 32, as you would see in CIDR notation.

So a value of 32 corresponds to a mask of 255.255.255.255. A value of 31 would be 255.255.255.254. A value of 24 would be 255.255.255.0. And so on.

The IPv6 prefix lengths are treated similarly, but are between 0 and 128.

These fields are pulled directly from the interfaces iterated in Java's NetworkInterface class getInterfaceAddresses() method. The values come from getNetworkPrefixLength().