A location routing number (LRN) is a 10-digit number which identifies a telephone switch for the purpose of routing telephone calls through the public switched telephone network (PSTN). This identifier has the format of a telephone number in accordance with the North American Numbering Plan (NANP).
A location routing number (LRN) is a 10-digit number which identifies a telephone switch for the purpose of routing telephone calls through the public switched telephone network (PSTN). This identifier has the format of a telephone number in accordance with the North American Numbering Plan (NANP).
Source: Wikipedia "Location routing number" · CC BY-SA 4.0
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