This document provides information about dynamic IP addresses. It begins by explaining that dynamic IP addresses are not fixed and can change 2-3 times per day as opposed to fixed IP addresses which do not change over time. It then lists some advantages of dynamic IP addresses such as reducing operating costs for internet service providers by allowing them to reuse IP addresses. However, it also notes disadvantages like being forced to rely on services that redirect to the current IP host since it can change. The document concludes by describing the three methods an DHCP server can use to assign IP addresses: manually with a MAC to IP address table, automatically from a preset range, or dynamically where addresses are reused.