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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
983-888 9 Denver CO 6010 NEW CINGULAR WIRELESS PCS, LLC 656   2023-08-24   
983-955 3 Denver CO 6010 NEW CINGULAR WIRELESS PCS, LLC 656   2025-10-27   
983-955 4 Denver CO 6010 NEW CINGULAR WIRELESS PCS, LLC 656   2025-10-27   
983-955 6 Denver CO 6010 NEW CINGULAR WIRELESS PCS, LLC 656   2025-10-27   
983-983 7 Longmont CO 6010 NEW CINGULAR WIRELESS PCS, LLC 656   2023-09-08   

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Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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