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: BLTMMDCHXNX

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
667-492 2 Severn MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2024-07-22   
667-492 3 Severn MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2024-07-22   
667-492 4 Severn MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2024-07-22   
667-492 5 Severn MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2024-07-22   
667-492 6 Severn MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2024-07-22   
667-895 5 Baltimore MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2021-07-12   

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Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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