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A system must have a registered IP address to be visible from the Internet. Registered IP addresses, often referred to as public IP addresses, are assigned by an Internet Service Provider (ISP) and ensure that the device can communicate over the broader Internet. These addresses are routable, meaning they can be reached from any other Internet-connected device.

Private IP addresses, on the other hand, are used within local networks and cannot be accessed directly from the Internet. Dynamic IP addresses change periodically and can still be registered, but the key point is that they need to be publicly routable to be visible externally. Static IP addresses refer to those that do not change and can also be registered, contributing to visibility on the Internet, but the focus is on the registration aspect to ensure that an IP address can be routed globally. Thus, a registered IP address is fundamental for visibility from the Internet.