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: DRBRMIFBDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-206 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-248 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-317 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-322 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-323 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-337 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-390 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-594 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-619 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-621 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-722 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-755 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      
313-845 A Detroit Zone 6 MI 9323 AMERITECH MICHIGAN 340      

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

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