Panasonic FP2 ET-LAN Technical Manual page 271

Routing information setting area (Bank 0)
Address Name
230H Network
(subnetwork)
masking (L)
231H Network
(subnetwork)
masking (H)
Default Set value and explanation
0000H FF000000H to FFFFFFFCH: Field value that determines network
address or subnetwork address.
- The network (subnetwork) mask is a value that sets the 32-bit
network address used as the IP address and the bit used for the
0000H
subnetwork address to "1".
Example:
FF000000H: For a Class A network
1111 1111 0000 0000 0000 0000 0000 0000
FFC00000H: When 2 bits are used for a Class A network
1111 1111 1100 0000 0000 0000 0000 0000
FFFF0000H: For a Class B network
1111 1111 1111 1111 0000 0000 0000 0000
FFFFF000H: When 4 bits are used for a Class B subnetwork
1111 1111 1111 1111 1111 0000 0000 0000
FFFFFF00H: For a Class C network
1111 1111 1111 1111 1111 1111 0000 0000
FFFFFFE0H: When 3 bits are used for a Class C subnetwork
1111 1111 1111 1111 1111 1111 1110 0000
- An error occurs if FFFFFFFDH or higher is specified.
- The network (subnetwork) address is the address that results from
the logical AND of the IP address for a source node and the network
(subnetwork) mask, in the same class and with the same network
address.
Example: If the source node IP address is 59010201H:
- When FF000000H is specified for the network mask, 59000000H will
be the network address (Class A network).
- When FFFF0000H is specified for the subnetwork mask, 59010000H
will be the subnetwork address (Class B network).
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