Freescale Semiconductor TWR-MCF52259-Ethenet User Manual page 26

Each IP address contains a node address and a network address.
The subnet mask determines which bits identify a node address, and
which bits identify a network address.
The network bits are the 1's, the node bits are the 0's.
Default subnet masks
Class A – 255.0.0.0
•
Class B – 255.255.0.0
•
Class C – 255.255.255.0
•
CIDR = Classless Inter Domain Routing
Eliminates class restrictions
Uses 192.168.1.99/24 nomenclature ( 24 = # of ones from left )
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255 networks, > 16million nodes
64K networks, 64K nodes
>16 million networks, 255 nodes
giving finer control to netmask.
IP Subnetting
25
TM