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: SXFLSDCOX1X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-291 8 Madison SD 073H TELNYX LLC 640   2021-03-22   
605-401 5 Sioux Falls SD 073H TELNYX LLC 640   2021-12-21   
605-405 0 Arlington SD 073H TELNYX LLC 640   2023-07-10   
605-549 8 Spearfish SD 073H TELNYX LLC 640   2023-03-19   
605-581 0 Mobridge SD 073H TELNYX LLC 640   2023-07-29   
605-600 9 Rapid City SD 073H TELNYX LLC 640   2024-11-15   
605-601 8 Sioux Falls SD 073H TELNYX LLC 640   2023-03-17   
605-601 9 Sioux Falls SD 073H TELNYX LLC 640   2023-03-17   
605-621 0 Madison SD 073H TELNYX LLC 640   2023-09-30   
605-808 9 Redfield SD 073H TELNYX LLC 640   2023-06-19   
605-898 0 Iroquois SD 073H TELNYX LLC 640   2023-06-17   
605-952 1 Elk Point SD 073H TELNYX LLC 640   2021-03-07   
605-998 0 Miller SD 073H TELNYX LLC 640   2021-11-09   
712-888 A Beloit IA 073H TELNYX LLC 640      
712-888 8 Beloit IA 073H TELNYX LLC 640   2017-04-20   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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