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.

NPA: 313 [Rate centres in NPA 313] [Dial plan for NPA 313]

NXX: 344

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-344 A Detroit Zone 2 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
313-344 0 Detroit Zone 2 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
313-344 1 Detroit Zone 2 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
313-344 2 Detroit Zone 2 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
313-344 3 Detroit Zone 2 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
313-344 4 Detroit Zone 2 MI DTRTMIBHMMD  1200 TALK AMERICA INC. - MI 340   2006-05-05   
313-344 5 Detroit Zone 2 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2007-05-18   
313-344 6 Detroit Zone 2 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2007-05-18   
313-344 7 Detroit Zone 2 MI SFLDMIQJDS1  7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 340   2006-07-06   
313-344 8 Detroit Zone 2 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      
313-344 9 Detroit Zone 2 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC. - MI 340      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.