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: PHLAPAFGDSS

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
610-557 6 Philadelphia Suburban Zone 22 PA 7341 XO COMMUNICATIONS SERVICES, INC. - PA 228   2013-08-26   
610-557 7 Philadelphia Suburban Zone 22 PA 7341 XO COMMUNICATIONS SERVICES, INC. - PA 228   2013-08-26   

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Last updated: Fri, 22 Mar 2024 03:02:44 UTC

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