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.

Cartwright, OK

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
580-691 A OKCZOKZCFMD  5257 LEVEL 3 COMMUNICATIONS, LLC - OK 536      
580-691 2   5257 LEVEL 3 COMMUNICATIONS, LLC - OK 536   2018-03-01   
580-965 A CRTWOKXARS1  1979 CHEROKEE TEL. CO. 536      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.