![]() ![]() Network IP address breakdown for 172.16.0.0 / 12 A shortcut to this process is to simply take the host's IP address and set all bits in the host identifier portion of the address (any bit positions which hold a 0 in the subnet mask) to 1.Īs shown in the example below, in order to calculate the broadcast address to transmit a packet to an entire IPv4 subnet using the private IP address space 172.16.0.0 / 12, which has the subnet mask 255.240.0.0, the broadcast address is calculated as 172.16.0.0 bitwise ORed with 0.15.255.255 = 172.31.255.255. The broadcast address for any IPv4 host can be obtained by taking the bit complement (bitwise NOT) of the subnet mask and then performing a bitwise OR operation with the host's IP address. The later introduction of subnets and Classless Inter-Domain Routing changed this slightly, so that the all-ones host address of each subnet is that subnet's broadcast address. ![]() This method of using the all-ones address was first proposed by R. The all-ones value was established as the standard broadcast address for networks that support broadcast. In Internet Protocol version 4 ( IPv4) networks, broadcast addresses are special values in the host-identification part of an IP address. ![]()
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