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: 575 [Rate centres in NPA 575] [Dial plan for NPA 575]

NXX: 505

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
575-505 A Tierra Amarilla NM ESPNNMXC4MD  624H ONVOY SPECTRUM, LLC 664   2024-04-07   
575-505 0 Tierra Amarilla NM   145J TERRA NOVA TELECOM INC. 664   2025-07-06   
575-505 5 Tierra Amarilla NM ESPNNMXC4MD  624H ONVOY SPECTRUM, LLC 664   2024-04-07   

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.