broadcast address

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broadcast address

An address that enables transmission to every node in a local network. The address is the highest numeric value of the address format being used. An Ethernet broadcast address is all binary 1's. An IP broadcast address is the highest number in its class; for example, the broadcast address of a Class C 192.168.16.0 network is 192.168.16.255.

Subnet Broadcast Addresses
The broadcast address for a subnet must account for the part of the address that is reserved for the subnet. Using the above Class C example configured for six subnets would have a broadcast address of 192.168.16.31. It is derived as follows. For more on the Class C example, see subnet mask. See broadcast and multicast.
Class C Mask for Six Subnets  255      255      255    224
 11111111.11111111.11111111.11100000

 Step 1Invert the mask.0        0        0           31
 00000000.00000000.00000000.00011111

 Step 2OR the inverted mask with an IPaddress in the subnet, such as192.168.16.1. 192       168        16           1
 11000000.10101000.00010000.00000001 
 00000000.00000000.00000000.00011111
 -----------------------------------
 11000000.10101000.00010000.00011111
 192       168        16          31
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