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: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX: 821

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-821 A Nashua NH   829J PAETEC ITEL, LLC 122   2025-04-30   
603-821 0 Nashua NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-02-08   
603-821 1 Nashua NH   829J PAETEC ITEL, LLC 122   2004-10-24   
603-821 2 Nashua NH   829J PAETEC ITEL, LLC 122   2005-08-17   
603-821 3 Nashua NH   829J PAETEC ITEL, LLC 122   2003-06-02   
603-821 4 Nashua NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2003-01-01   
603-821 5 Nashua NH   829J PAETEC ITEL, LLC 122      
603-821 6 Nashua NH   829J PAETEC ITEL, LLC 122      
603-821 7 Nashua NH   829J PAETEC ITEL, LLC 122   2003-09-21   
603-821 8 Nashua NH   829J PAETEC ITEL, LLC 122   2005-08-17   
603-821 9 Nashua NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-08-29   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.