X.121 is an International Telecommunication Union (ITU) standard that specifies the addressing and routing of data in a connectionless packet-switching environment. It is part of a broader family of standards related to data communication, particularly regarding network layer protocols. Originally developed for use in the X.25 packet-switching network, X.121 is used to assign unique addresses to devices connected to a network, allowing for proper routing of data packets to the correct destination. The addressing format defined by X.
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