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: HSTWTXUFPS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
346-426 3 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2020-01-04   
346-786 3 Spring TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2020-10-26   
346-786 5 Spring TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2020-10-26   
713-258 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
713-258 9 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2008-01-18   

Last updated: Fri, 13 May 2022 22:16:13 UTC

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