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: BLTMMDCHXQX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
667-223 A Baltimore MD 197D VONAGE AMERICA LLC 238      
667-257 A Columbia MD 197D VONAGE AMERICA LLC 238      
667-280 A Ellicott City MD 197D VONAGE AMERICA LLC 238      
667-454 A Bel Air MD 197D VONAGE AMERICA LLC 238      
667-455 A Edgewood MD 197D VONAGE AMERICA LLC 238   2024-01-15   

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

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