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

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
832-749 7 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2010-10-25   
832-749 8 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2010-10-25   
832-749 9 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2010-10-25   
832-778 4 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2006-02-26   
832-778 5 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2006-02-26   
832-799 5 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2011-04-22   
832-799 6 Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560   2011-04-22   

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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