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: HLNAMTMADS1

Remotes:

Switch Switch name Switch type
ANCNMTMARS1  ANACONDA  AXR 
BLDRMTMARS1  BOULDER  AXR 
CLNCMTMARS1  CLANCY  AXR 
CNFYMT02RS1  CANYON FERRY  AXR 
DLLNMTMARS1  DILLON  AXR 
DRLDMTMARS1  DEER LODGE  AXR 
OPRTMTMARS1  OPPORTUNITY  AXR 
TWNSMTMARS1  TOWNSEND  AXR 
WHTHMTMARS1  WHITEHALL  AXR 
WLCKMTMARS1  WOLF CREEK  AXR 
WRSPMTMARS1  WARM SPRINGS  AXR 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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