Multitek Comm-Box Guide de l'utilisateur télécharger pdf (Page 99)

ADSL/VoIP Gateway User’s Guide IP Addresses, Network Masks, and Subnets

Similarly, to split a class C network into four subnets, the mask is:

255.255.255.192 or 11111111. 11111111. 11111111.11000000

The two extra bits in field4 can have four values (00, 01, 10, 11), so

there are four subnets. Each subnet uses the remaining six bits in

field4 for its host IDs, ranging from 1 to 62.

Note

Sometimes a subnet mask does not specify any additional

network ID bits, and thus no subnets. Such a mask is called a

default subnet mask. These masks are:

Class A: 255.0.0.0

Class B: 255.255.0.0

Class C: 255.255.255.0

These are called default because they are used when a network is

initially configured, at which time it has no subnets.

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Multitek Comm-Box Guide de l'utilisateur Page 99