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
443-229 8 Severna Park MD 197D VONAGE AMERICA LLC 238   2022-10-07   
443-749 3 Glen Burnie MD 197D VONAGE AMERICA LLC 238   2020-05-13   
443-749 6 Glen Burnie MD 197D VONAGE AMERICA LLC 238   2020-05-13   
443-830 8 Catonsville MD 197D VONAGE AMERICA LLC 238   2022-10-07   
667-223 A Baltimore MD 197D VONAGE AMERICA LLC 238      
667-223 0 Baltimore MD 197D VONAGE AMERICA LLC 238   2017-10-07   
667-223 1 Baltimore MD 197D VONAGE AMERICA LLC 238   2017-10-07   
667-257 A Columbia MD 197D VONAGE AMERICA LLC 238      
667-257 0 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 1 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 2 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 3 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 4 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-30   
667-278 0 Towson MD 197D VONAGE AMERICA LLC 238   2020-05-13   
667-278 1 Towson MD 197D VONAGE AMERICA LLC 238   2020-05-13   
667-280 A Ellicott City MD 197D VONAGE AMERICA LLC 238      
667-280 3 Ellicott City MD 197D VONAGE AMERICA LLC 238   2020-06-19   
667-280 7 Ellicott City MD 197D VONAGE AMERICA LLC 238   2020-06-19   
667-299 0 Annapolis MD 197D VONAGE AMERICA LLC 238   2020-06-02   
667-299 1 Annapolis MD 197D VONAGE AMERICA LLC 238   2020-06-02   
667-300 2 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-06   
667-300 4 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-06   
667-300 5 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-06   
667-300 6 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-06   
667-300 7 Columbia MD 197D VONAGE AMERICA LLC 238   2018-12-06   
667-338 9 Crofton MD 197D VONAGE AMERICA LLC 238   2022-10-07   
667-454 A Bel Air MD 197D VONAGE AMERICA LLC 238      
667-454 2 Bel Air MD 197D VONAGE AMERICA LLC 238   2023-12-08   
667-455 A Edgewood MD 197D VONAGE AMERICA LLC 238   2024-01-15   
667-455 5 Edgewood MD 197D VONAGE AMERICA LLC 238   2024-01-15   

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

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