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: MCRKPAMRDS0

Remotes:

Switch Switch name Switch type
IMPRPAIMRS0  IMPERIAL  RSC 
OKDLPAOARS0  OAKDALE -ALLEGHENY-  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
412-331 A Pittsburgh Zone 7 PA 9208 VERIZON PENNSYLVANIA, INC. 234      
412-771 A Pittsburgh Zone 7 PA 9208 VERIZON PENNSYLVANIA, INC. 234      
412-777 A Pittsburgh Zone 7 PA 9208 VERIZON PENNSYLVANIA, INC. 234      
412-778 A Pittsburgh Zone 7 PA 9208 VERIZON PENNSYLVANIA, INC. 234      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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