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.

Porum, OK

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
539-414 A TULTOKCL8MD  5257 LEVEL 3 COMMUNICATIONS, LLC - OK 538      
539-414 2 TULTOKCL8MD  5257 LEVEL 3 COMMUNICATIONS, LLC - OK 538   2017-11-30   
539-414 4   145J TERRA NOVA TELECOM INC. 538   2025-07-12   
918-484 A PORMOKXADS0  1985 CROSS TEL. CO. 538      
918-603 A TULSOKPP7MD  148G CROSS WIRELESS, L.L.C. 538      

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

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