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: BLTNILXDDS0

Remotes:

Switch Switch name Switch type
CRLCILXDRS0  CARLOCK  GTR 
CRPSILXDRS0  CROPSEY  GTR 
DWNSILXDRS0  DOWNS  GTR 
HDSNILXDRS0  HUDSON  GTR 
LROYILXDRS0  LE ROY  GTR 
STFRILXDRS0  STANFORD  GTR 
SYBKILXDRS0  SAYBROOK  GTR 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
309-556 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      
309-557 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      
309-820 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      
309-821 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      
309-823 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      
309-827 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      
309-828 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      
309-829 A Bloomington IL 1015 FRONTIER NORTH, INC. - IL 366      

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

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