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.

Heavener, OK

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
539-220 A TULSOKTBX6Z  508J CENTURYLINK COMMUNICATIONS, LLC 538      
539-220 0   145J TERRA NOVA TELECOM INC. 538   2025-07-17   
539-220 3 TULTOKCL8MD  5257 LEVEL 3 COMMUNICATIONS, LLC - OK 538   2019-03-23   
539-220 6 TULSOKTBX8Y  530C TELEPORT COMMUNICATIONS AMERICA OK - LLC 538   2019-10-04   
539-220 7 TULSOKTBX6Z  508J CENTURYLINK COMMUNICATIONS, LLC 538   2017-06-08   
918-653 A HVNROKXARS1  2011 OKLAHOMA WINDSTREAM, INC. 538      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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