What Is Network Prefix Length?
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Network prefix length is a measure of the number of leading bits of an IP address that are used to indicate the network to which it belongs. It is also referred to as the subnet mask or netmask. The prefix length is expressed as a number, usually between 0 and 32, and is written after the IP address, separated by a slash. For example, 192.168.1.1/24 indicates that the first 24 bits of the IP address are used to identify the network.