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: 228

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-228 A Detroit Zone 6 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC.-MI 340      
313-228 0 Detroit Zone 6 MI SFLDMIDICA0  2550 123 NET, INC. 340   2003-01-25   
313-228 1 Detroit Zone 6 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC.-MI 340      
313-228 2 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2019-05-10   
313-228 3 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLC - MI 340   2014-10-12   
313-228 4 Detroit Zone 6 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC.-MI 340      
313-228 5 Detroit Zone 6 MI WAYNMIMNXNX  8935 COMCAST PHONE OF MICHIGAN, LLC - MI 340   2007-11-10   
313-228 6 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2014-09-06   
313-228 7 Detroit Zone 6 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC.-MI 340      
313-228 8 Detroit Zone 6 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC.-MI 340      
313-228 9 Detroit Zone 6 MI SFLDMIOL1MD  4044 GLOBAL CROSSING TELEMANAGEMENT, INC.-MI 340      

Last updated: Sun, 07 Feb 2021 01:52:50 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.