Learn in the textbookIP Addresses and the Address System
DefinitionA global IP address (グローバルIPアドレス) is an IP address assigned on the internet with no duplicate anywhere in the world, and it can be reached directly from outside.
ExplanationIf one number existed in two places, the destination would be ambiguous, so these addresses are assigned through providers (ISPs) and others, within a framework headed by ICANN, the international body that manages the numbers. Devices that accept outside connections, such as web servers, normally use this kind of address.
AnalogyThink of a company's main phone number. Call it from anywhere in the world and you reach the same company.
Memory hookGlobal shares its root with globe, which points to one of a kind on the whole planet.