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.

Alton, NH

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
603-855 A ROCHNHWE4MD  314C IDT AMERICA, CORP. - NH 122      
603-855 2 ROCHNHWE4MD  314C IDT AMERICA, CORP. - NH 122   2009-12-18   
603-855 5 DOVRNHTHXEX  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2020-04-05   
603-875 A ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 0 ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 2 ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 3 ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 5 ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 6 ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 7 ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 9 ALTNNHXARP0  0049 UNION TEL. CO. 122      

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.