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: SFLDMIOL1MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-436 A Southfield MI 4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
248-436 0 Southfield MI 4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
313-544 A Detroit Zone 4 MI 4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
586-863 9 Roseville MI 4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
586-935 A Washington MI 4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
734-271 A Carleton MI 4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.