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.
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Brookings, SD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
605-736 6   6701 AERIAL COMMUNICATIONS, INC. 640   2025-07-24   
605-736 7 SXFLSDCHMMD  5562 METROPCS, INC. 640   2021-03-08   
605-736 8 SXFLSDPSCMD  516J TON80 COMMUNICATIONS, LLC 640   2021-09-09   
605-736 9 SXFLSDCHMMD  6701 AERIAL COMMUNICATIONS, INC. 640   2021-03-01   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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