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: 580 [Rate centres in NPA 580] [Dial plan for NPA 580]

NXX: 606

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
580-606 A Duncan OK OKCYOKSX4MD  6529 T-MOBILE USA, INC. 536      
580-606 0 Duncan OK ENIDOKKI0MD  6272 UNITED STATES CELLULAR - OK 536   2006-06-19   
580-606 1 Duncan OK OKCYOKSX4MD  6529 T-MOBILE USA, INC. 536   2006-10-29   
580-606 2 Duncan OK OKCYOKMTG01  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 536   2007-06-13   
580-606 3 Duncan OK OKCYOKMTG01  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 536   2007-06-13   
580-606 4 Duncan OK OKCYOKSX4MD  6529 T-MOBILE USA, INC. 536   2008-02-03   
580-606 5 Duncan OK OKCYOKCEXCZ  939H COMMIO, LLC 536   2022-08-11   
580-606 6 Duncan OK OKCZOKZCFMD  5257 LEVEL 3 COMMUNICATIONS, LLC - OK 536   2008-03-25   
580-606 7 Duncan OK   6529 T-MOBILE USA, INC. 536   2007-05-11   
580-606 8 Duncan OK OKCYOKSX4MD  6529 T-MOBILE USA, INC. 536      
580-606 9 Duncan OK OKCYOKSX4MD  5562 METROPCS, INC. 536      

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.