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: MSCTILXEDS0

Remotes:

Switch Switch name Switch type
ALBRILXERS0  ALBERS  RSC 
FYVLILXERS0  FAYETTEVILLE  RSC 
MLSTILXERS0  MILLSTADT 1  RSC 
MLSTILXERS2  WESTVIEW 2  RSS 
NWBDILXERS0  NEW BADEN  RSC 
OKVLILXERS1  OKAWVILLE  RSC 
SRFDILXERS0  SUMMERFIELD  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
618-566 A Mascoutah IL 1036 FRONTIER NORTH, INC. - IL 520      

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

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