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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OCN: 370E YMAX COMMUNICATIONS CORP. - WY

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
307-212 9 Rock Springs WY CHYNWYMAX4X  654   2009-11-25   
307-223 7 Laramie WY CHYNWYMAX4X  654   2011-03-29   
307-343 4 Laramie WY CHYNWYMAX4X  654   2009-11-25   
307-529 0 Cheyenne WY CHYNWYMAX4X  654   2009-10-09   
307-922 8 Rock Springs WY CHYNWYMAX4X  654   2010-09-03   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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