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: 325 [Rate centres in NPA 325] [Dial plan for NPA 325]

NXX: 377

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
325-377 A London TX   515J IP HORIZON LLC 961   2025-04-04   
325-377 1 London TX   515J IP HORIZON LLC 961   2025-04-04   
325-377 2 London TX   515J IP HORIZON LLC 961   2025-04-04   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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