If a network address is subnetted, the first subnet obtained after subnetting the network address is called subnet zero.Ĭonsider a Class B address, 172.16.0.0. Subnetting has guidelines that cover the use of the first and the last subnets, known as subnet zero and the all-ones subnet, respectively. Coupled with other technologies like Network Address Translation (NAT) and Port Address Translation (PAT), it allows for the more efficient use of available IP address space and greatly alleviates the problem of address depletion. Subnetting breaks down a given network address into smaller subnets. Conventionsįor more information on document conventions, refer to the Use Format Conventions for Technical Tips and Other Content. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. This document describes the use of subnet zero and the all-ones subnet.
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