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: 499

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-499 A Detroit Zone 2 MI DTRTMILXDS0  9323 MICHIGAN BELL TEL CO 340      
313-499 0 Detroit Zone 2 MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2010-12-10   
313-499 1 Detroit Zone 2 MI WAYNMIMNXUX  318J COMCAST IP PHONE, LLC 340   2007-04-01   
313-499 2 Detroit Zone 2 MI DTRTMILXDS0  9323 MICHIGAN BELL TEL CO 340      
313-499 3 Detroit Zone 2 MI   279B CLEAR RATE COMMUNICATIONS, INC. - MI 340   2009-06-04   
313-499 4 Detroit Zone 2 MI DTRTMILXDS0  9323 MICHIGAN BELL TEL CO 340      
313-499 5 Detroit Zone 2 MI DTRTMIBHMMD  1200 TALK AMERICA INC. - MI 340   2005-07-26   
313-499 6 Detroit Zone 2 MI DTRTMIBHMMD  1200 TALK AMERICA INC. - MI 340   2005-10-21   
313-499 7 Detroit Zone 2 MI   3535 ACD TELECOM, INC. - MI 340   2005-12-08   
313-499 8 Detroit Zone 2 MI WAYNMIMNXUX  318J COMCAST IP PHONE, LLC 340   2007-04-01   
313-499 9 Detroit Zone 2 MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2010-12-10   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.