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.

OCN: 907K ALLO COMMUNICATIONS LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
970-743 3 Fort Morgan CO   656   2018-10-14   
970-771 4 Breckenridge CO   656   2019-06-24   
970-861 5 Greeley CO   656   2024-10-13   
970-972 5 Eaton CO   656   2023-03-11   
983-955 A Denver CO   656   2025-10-24   
983-955 5 Denver CO   656   2025-10-24   

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Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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