Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: TCSMAZCHEMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
520-420 A Tucson AZ 321J HD CARRIER LLC 668      
520-420 9 Tucson AZ 321J HD CARRIER LLC 668   2020-02-08   
520-453 7 Tombstone AZ 321J HD CARRIER LLC 668   2020-11-15   
520-453 8 Tombstone AZ 321J HD CARRIER LLC 668   2020-11-15   
520-525 8 Bisbee AZ 321J HD CARRIER LLC 668   2020-11-15   
520-537 5 Tucson AZ 321J HD CARRIER LLC 668   2021-05-07   
520-537 6 Tucson AZ 321J HD CARRIER LLC 668   2021-05-07   
520-537 7 Tucson AZ 321J HD CARRIER LLC 668   2021-05-07   
520-537 8 Tucson AZ 321J HD CARRIER LLC 668   2021-05-07   
520-537 9 Tucson AZ 321J HD CARRIER LLC 668   2021-05-07   
520-636 4 San Manuel AZ 321J HD CARRIER LLC 668   2020-11-15   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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