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: 774 [Rate centres in NPA 774] [Dial plan for NPA 774]

NXX: 551

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
774-551 A Grafton MA   829J PAETEC ITEL, LLC 128      
774-551 0 Grafton MA   829J PAETEC ITEL, LLC 128      
774-551 1 Grafton MA   892D ONVOY, LLC - MA 128   2019-02-24   
774-551 2 Grafton MA   7135 TC SYSTEMS, INC. 128   2018-11-09   
774-551 3 Grafton MA   892D ONVOY, LLC - MA 128   2019-02-24   
774-551 4 Grafton MA   829J PAETEC ITEL, LLC 128      
774-551 5 Grafton MA   829J PAETEC ITEL, LLC 128      
774-551 6 Grafton MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2004-02-02   
774-551 7 Grafton MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2013-05-04   
774-551 8 Grafton MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2002-03-11   
774-551 9 Grafton MA   829J PAETEC ITEL, LLC 128   2001-07-12   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.