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 
BRKLMDBKRP0    RP 
CHASMDCHRP0    RP 
CLMAMDCBRP0  COLUMBIA  RP 
CLVLMDCERP0    RP 
GLBRMDGLRP0    RP 
NRPNMDNPRP0    RP 
RNTWMDRARP0    RP 
SVPKMDSPRP0    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: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.