Given the indicated requirements as a starting point for subnetting, identify the requested information. Include the prefix length in the network address only, for example: $19\mathrm{.}12\mathrm{.}5\mathrm{.}0/25.$ Express the Interval and Octet using, for example, the following format: $32,4$th$.$ Address: $192\mathrm{.}168\mathrm{.}1\mathrm{.}0/24$ Subnets: $21.$ Custom Address Map: $2.$ Custom Subnet Mask: $3.$ Number of Borrowed $($subnet$)$ Bits: $4.$ Total Number of Subnets Possible: $5.$ Number of Host Bits: $6.$ Total Number of Addresses per Subnet: $7.$ Total Number of Usable Addresses per Subnet: $8.$ Interval and Octet: $9.$ Network Address of the First Subnet: $10.$ First Usable Address of the First Subnet: