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: 203 [Rate centres in NPA 203] [Dial plan for NPA 203]

NXX: 303

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-303 A Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 0 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 1 Wallingford CT HRFRCTCR3MD  318J COMCAST IP PHONE, LLC 920      
203-303 2 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 3 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 4 Wallingford CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920      
203-303 5 Wallingford CT HRFRCTASDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 920      
203-303 6 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 7 Wallingford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920      
203-303 8 Wallingford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920      
203-303 9 Wallingford CT HRFRCT03HMD  073H TELNYX LLC 920      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.