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: ANNPMDANPS1

Remotes:

Switch Switch name Switch type
BLTMMDEDRP0  BALTIMORE  RP 
BLTMMDFRRP0    RP 
BLTMMDLBRP0    RP 
BLTMMDUVRP0    RP 
BLTMMDYKRP0    RP 
BRKLMDBKRP0    RP 
CHASMDCHRP0    RP 
CLMAMDCBRP0  COLUMBIA  RP 
CLVLMDCERP0    RP 
CYVLMDCKRP0    RP 
ESSXMDEXRP0    RP 
GLBRMDGLRP0    RP 
NRPNMDNPRP0    RP 
RNTWMDRARP0    RP 
RSTWMDRSRP0    RP 
SVPKMDSPRP0    RP 
TWSNMDTWRP0    RP 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-858 A Annapolis MD 9212 VERIZON MARYLAND, INC. 238      
410-858 9 Annapolis MD 9212 VERIZON MARYLAND, INC. 238   2005-05-02   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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