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.

Guilford, CT

<< 1 2

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
203-738 3   829J PAETEC ITEL, LLC 920      
203-738 4   829J PAETEC ITEL, LLC 920      
203-738 5 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2016-04-24   
203-738 6   829J PAETEC ITEL, LLC 920   2010-06-20   
203-738 7 NWLNCTCS6MD  508J CENTURYLINK COMMUNICATIONS, LLC 920   2014-07-08   
203-738 8 BLFDCTAP2MD  5562 METROPCS, INC. 920   2010-07-16   
203-738 9   6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2002-12-14   
203-884 A   639C ONVOY, LLC - CT 920      
203-884 0 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2015-05-09   
203-884 1 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2016-04-24   
203-884 2 NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-11-08   
203-884 3 NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-02-24   
203-884 4 NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2024-05-31   
203-884 5 NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-02-24   
203-884 6 HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2016-07-14   
203-884 7 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2019-02-18   
203-884 8 HRFRCT03HMD  073H TELNYX LLC 920   2018-05-02   
203-884 9   624H ONVOY SPECTRUM, LLC 920   2025-10-04   
475-274 A HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920      
475-274 0 HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2020-09-13   
475-274 1   515J IP HORIZON LLC 920   2022-07-29   
475-274 2   6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2025-05-30   
475-274 3 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2023-08-18   
475-274 4 NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-10-11   
475-274 5 NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-10-29   
475-274 6 HRFRCT0383Z  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920   2021-01-04   
475-274 7 HRFRCT03XSX  516J TON80 COMMUNICATIONS, LLC 920   2021-07-01   
475-274 8 NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-11-01   
475-274 9 HRFRCT0389Z  490J BOOST SUBSCRIBERCO L.L.C. 920   2023-05-21   
475-900 A HRFRCTBCDS1  639C ONVOY, LLC - CT 920      
475-900 0 HRFRCT03HMD  073H TELNYX LLC 920   2019-09-14   
475-900 1 HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2019-11-16   
475-900 2 HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2020-01-15   
475-900 3 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2020-07-06   
475-900 4 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2020-07-06   
475-900 5 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2020-07-06   
475-900 6 HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2020-08-09   
475-900 7 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2019-09-13   
475-900 8 HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2019-09-13   
475-900 9 HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2020-05-23   

<< 1 2

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.