What is the fixed length subnet?

A fixed-length subnet, also known as fixed-length subnet masking (FLSM), is a method of subnetting where all subnets created from a given network have the same size and number of host addresses. This approach simplifies routing and network management since each subnet is uniform in size, making it easier to allocate IP addresses. However, it can lead to inefficient use of IP addresses if some subnets have fewer hosts than needed, as they may waste available address space.