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: HSTNTXAIDS0

Remotes:

Switch Switch name Switch type
HSTNTXSHRS0  SHELDON  RSC 

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
281-978 9 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-999 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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