Comment: Internal networks are not

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In reply to comment: I have a static IP at home. (see in situ)

Internal networks are not

Internal networks are not what is counted when looking at whether you have a static or dynamic IP. Whether you have a network or not, it is only ever assigned one IP address at a given time; it doesnt matter if you have one device on a network or 100 devices.
Whether the "outside" IP address assigned to you changes or not is what matters.

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