A private IP address is assigned to a device within a closed network and is not readily available to search for on the internet. There are three address spaces resevered for this function. Two of the reserved address spaces are $192\mathrm{.}168\mathrm{.}0\mathrm{.}0,172\mathrm{.}16\mathrm{.}0\mathrm{.}0.$

What is the third available closed network address space available?