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.

NPA: 430 [Rate centres in NPA 430] [Dial plan for NPA 430]

NXX: 450

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
430-450 A Longview TX   321J HD CARRIER LLC 554   2026-01-22   
430-450 6 Longview TX   321J HD CARRIER LLC 554   2026-01-22   
430-450 7 Longview TX   321J HD CARRIER LLC 554   2026-01-22   
430-450 8 Longview TX   321J HD CARRIER LLC 554   2026-01-22   
430-450 9 Longview TX   321J HD CARRIER LLC 554   2026-01-22   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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