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Interchangeable NPA and central office codes (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Interchangeable NPA and central office codes" in English language version.

refsWebsite
Global rank English rank
1nationalnanpa.com
2,470th place
1,321st place

nationalnanpa.com (Global: 2,470th place; English: 1,321st place)

  • North American Numbering Plan Administration (1993-01-13). "Status of Numbering Plan Area (NPA) Codes in World Zone 1, Bellcore Information Letter IL–93/01-017" (PDF). Bellcore. Retrieved 2020-08-21.