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: DTRTMIRFDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-777 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
248-777 0 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-255 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-387 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-531 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-532 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-533 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-534 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-535 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-537 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-538 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-541 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-543 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-543 0 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-543 1 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-543 2 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-543 6 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-543 7 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-543 9 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-592 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 A Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 0 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 1 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 2 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 3 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 4 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 5 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 6 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 7 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      
313-794 8 Detroit Zone 5 MI 9323 AMERITECH MICHIGAN 340      

Last updated: Tue, 04 May 2021 15:04:27 UTC

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