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: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 661

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-661 A Waterloo MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-661 0 Waterloo MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-661 1 Waterloo MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-661 2 Waterloo MD BLTMMDCHLMD  082H LOCAL ACCESS LLC - MD 238   2017-07-07   
443-661 3 Waterloo MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-661 4 Waterloo MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2008-10-06   
443-661 5 Waterloo MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-661 6 Waterloo MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2021-01-28   
443-661 7 Waterloo MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2020-05-02   
443-661 8 Waterloo MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.