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The x25 prefix frequently refers to the , an older ITU-T standard suite for packet-switched data communication in wide area networks.
: X.25 is used to establish reliable virtual circuits over networks with high error rates, common in legacy financial systems and aviation. x25 nord.txt
: Systems using X.25 services often require a database table (sometimes stored in an X25.CONF or similar text file) to map Internet addresses to X.25 addresses. The x25 prefix frequently refers to the ,