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: 413 [Rate centres in NPA 413] [Dial plan for NPA 413]

NXX: 421

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
413-421 A Holyoke MA SPFDMAWOX9Y  478J NUSO, LLC 126   2024-12-08   
413-421 0 Holyoke MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 126   2025-01-22   
413-421 1 Holyoke MA SPFDMAWOX9Y  478J NUSO, LLC 126   2024-11-25   
413-421 9 Holyoke MA SPFDMAWOCMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 126   2024-10-05   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.