Difference between revisions of "Netmask"
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Revision as of 08:28, 29 April 2009
A Netmask masks the bits of your network for a particular IP. A netmask is a continuous stream of binary 1's from 0 through 32 bits. Here is a few common netmasks
IP: 192.168.0.1 NM: 255.255.255.0
So the network the netmask indicates is 192.168.0.0/24. Netmasks are often written in CIDR notation, in IPv4 and almost exclusively in IPv6. A /64 which is common in delegation in IPv6 holds an immense amount of data, yet it would be wrong to write it as FFFF:FFFF:FFFF:FFFF::, at least it seems wrong.
