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: 281 [Rate centres in NPA 281] [Dial plan for NPA 281]

NXX: 661

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
281-661 A Houston TX HSTQTX02DS4  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 560      
281-661 0 Houston TX   6701 AERIAL COMMUNICATIONS, INC. 560   2010-01-30   
281-661 1 Houston TX   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 560   2010-06-13   
281-661 2 Houston TX   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 560   2009-05-25   
281-661 3 Houston TX   7239 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 560   2009-08-13   
281-661 4 Houston TX   829J PAETEC ITEL, LLC 560   2009-10-20   
281-661 5 Houston TX   903C ONVOY, LLC - TX 560   2010-06-21   
281-661 6 Houston TX   903C ONVOY, LLC - TX 560   2010-07-16   
281-661 7 Houston TX   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 560   2010-08-02   
281-661 8 Houston TX   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 560   2010-08-02   
281-661 9 Houston TX   6701 AERIAL COMMUNICATIONS, INC. 560   2010-01-30   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.