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: AURRCO20PS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-522 A Denver CO 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-522 5 Denver CO 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2011-01-17   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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