When a range of IP addresses is set aside for client devices, and one of these IPs is issued to these devices when they request one, this is known as allocation.

The answer is "Dynamic".

Explanation:

The dynamic allocation of the IP address describes the difference from once in a while, unlike with a static IP address.  

In this many residential networks are work on different IP addresses, which requires, and provides clarification. It is also known as an economical, Provides by "ISP" to allocate a dynamic IP address to certain subscribers.

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