A dynamic IP address is the temporary address of a device connected to a network that changes over time. Compared to static IP addresses, dynamic IP addresses are easier to manage and users do not need to perform any additional setup or network configuration. It is the default IP address type provided by Internet service providers (ISPs) and is available to most Internet users. With the development of the Internet, the exhaustion of IPv4 addresses has led to the wide application of dynamic IP addresses.

The need for an unlimited number of IP addresses was not foreseen when the Internet was first built, so the IPv4 protocol's 4.3 billion address cap seemed adequate. However, with the rapid development of the Internet and the rapid growth of the number of connected devices, the problem of insufficient IPv4 addresses has become increasingly prominent. In response to IPv4 address exhaustion, many ISP providers have limited the number of static IP addresses assigned and adopted a strategy of temporarily assigning IP addresses from the IP pool to the requesting Dynamic Host Configuration Protocol (DHCP) computer, thus saving the number of remaining IP addresses. This temporary IP address is called a dynamic IP address.

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Dynamic IP addresses work as follows: When a computer connects to the Internet and requests DHCP, the DHCP server dynamically assigns an IP address (similar to a temporary phone number) to that computer. This IP address is valid only for the duration of the current Internet session or for a specific period of time. Once a user disconnects from the Internet, the dynamic IP address used is returned to the IP pool and made available to other users. Even if the user reconnects immediately, it is unlikely to get the same IP address again because the DHCP server assigns it based on available IP addresses.

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Using dynamic IP addresses brings many advantages. First, it saves IP address resources because IP addresses are limited. Secondly, dynamic IP addresses make network management more flexible, and IP addresses can be recycled and allocated at any time, which ADAPTS to the needs of the development of the Internet. However, it is important to note that the instability of dynamic IP addresses can have an impact on some specific applications. For example, a server or application that requires a stable connection over a long period of time may be better suited to use a static IP address to ensure continuous communication and service.

In the modern Internet, dynamic IP addresses, as a flexible solution, have become the first choice of most Internet users. It provides users with a convenient and economical way to connect, and saves IP address resources for ISP providers. However, with the depletion of IPv4 addresses and the continuous development of the Internet, the promotion and adoption of IPv6 protocol has become an important way to solve the problem of IP address shortage. In summary, dynamic IP addresses play an important role in the modern Internet, which provides important support for the continuous and stable operation of the Internet.