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: MRTNILXDDS2

Remotes:

Switch Switch name Switch type
GVLDILXDRS1  GROVELAND  5ER 
HPDLILXDRS2  HOPEDALE  5ER 
MCKNILXDRS2  MACKINAW  5ER 
TRMTILXDRS0  TREMONT  5ER 
WASHILXDRS3  WASHINGTON  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
309-263 A Morton IL 1015 FRONTIER NORTH, INC. - IL 368      
309-266 A Morton IL 1015 FRONTIER NORTH, INC. - IL 368      
309-284 A Morton IL 1015 FRONTIER NORTH, INC. - IL 368      
309-866 A Morton IL 1015 FRONTIER NORTH, INC. - IL 368      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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