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.

Switch: DNCNOKMADS0

Remotes:

Switch Switch name Switch type
MRLWOKMARS1  MARLOW  5ER 
RSSPOKMARS1  RUSH SPRINGS  5ER 
RYANOKMARS1  RYAN  5ER 
WARKOKMARS1  WAURIKA  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
580-251 A Duncan OK 9533 SOUTHWESTERN BELL 536      
580-251 2 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-251 3 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-251 4 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-251 5 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-251 6 Duncan OK 9533 SOUTHWESTERN BELL 536   2016-09-06   
580-251 7 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-251 8 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-251 9 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 A Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 0 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 1 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 2 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 3 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 4 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 5 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 6 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 8 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-252 9 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-255 A Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 A Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 0 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 1 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 2 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 3 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 4 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 7 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 8 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-470 9 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-475 A Duncan OK 9533 SOUTHWESTERN BELL 536      
580-475 0 Duncan OK 9533 SOUTHWESTERN BELL 536      
580-475 3 Duncan OK 9533 SOUTHWESTERN BELL 536      

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.