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: ALXNVAGBPS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-280 A Laurel MD 107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236      
240-483 A Washington Zone 2 MD 107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236      
240-669 A Washington Zone 11 MD 107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236      
240-770 A Washington Zone 4 MD 107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236      
301-328 A Washington Zone 3 MD 107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2006-08-05   
571-208 A Manassas VA 7773 COMCAST PHONE OF VIRGINIA, INC. - VA 236      

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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