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
281-657 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
281-720 A Satsuma TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
346-542 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
713-258 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
713-490 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-200 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-201 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-202 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-203 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-204 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-209 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-218 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-327 A Houston Suburban TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-369 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-383 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-436 A Bammel TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-518 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-550 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      
832-749 A Houston TX 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 560      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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