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: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX: 433

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-433 A Washington Zone 5 MD ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-433 0 Washington Zone 5 MD ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-433 1 Washington Zone 5 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-433 2 Washington Zone 5 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-433 3 Washington Zone 5 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-433 4 Washington Zone 5 MD WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236      
301-433 5 Washington Zone 5 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-433 6 Washington Zone 5 MD   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-433 7 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-433 8 Washington Zone 5 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-433 9 Washington Zone 5 MD BTVLMD127MD  5562 METROPCS, INC. 236      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.