Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 667 [Rate centres in NPA 667] [Dial plan for NPA 667]

NXX: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-257 A Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 0 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 1 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 2 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 3 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 4 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-30   
667-257 5 Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-10-16   
667-257 6 Columbia MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2021-05-01   
667-257 7 Columbia MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-11-26   
667-257 8 Columbia MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-06-27   
667-257 9 Columbia MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-06-27   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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