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: CMBRMDCMDS0

Remotes:

Switch Switch name Switch type
HONGMDHGRS0  HONGA  RSC 
VINNMDVNRS0  VIENNA  RSC 
WNGTMDWGRS0  WINGATE  RLC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-221 A Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-228 A Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 A Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 0 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 1 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 2 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 4 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 5 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 6 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 8 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      
410-901 9 Cambridge MD 9212 VERIZON MARYLAND, INC. 242      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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