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.
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OCN: 321J HD CARRIER LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
413-601 1 Pittsfield MA SPFDMAOI9MD  126   2025-11-28   
413-601 2 Pittsfield MA SPFDMAOI9MD  126   2025-11-28   
413-601 3 Pittsfield MA SPFDMAOI9MD  126   2025-11-28   
413-602 2 Springfield MA SPFDMAOI9MD  126   2026-03-20   
413-602 3 Springfield MA SPFDMAOI9MD  126   2026-03-20   
414-261 A Milwaukee Zone 1 WI MILWWIAU07Z  356      
414-261 9 Milwaukee Zone 1 WI MILWWIAU07Z  356   2020-11-23   
414-300 4 Milwaukee Zone 1 WI MILWWIAU07Z  356   2025-08-10   
414-300 5 Milwaukee Zone 1 WI MILWWIAU07Z  356   2025-08-10   
415-214 6 San Francisco: Central DA CA SNFCCA21XOZ  722   2026-06-01   
415-417 6 San Francisco: Central DA CA SNFCCA21XOZ  722   2026-06-01   
415-908 5 San Francisco: Central DA CA SNFCCA21XOZ  722   2026-06-01   
415-909 1 San Francisco: Juniper DA CA SNFCCA21XOZ  722   2016-06-09   
415-909 2 San Francisco: Juniper DA CA SNFCCA21XOZ  722   2016-06-09   
415-909 6 San Francisco: Juniper DA CA SNFCCA21XOZ  722   2016-06-28   
417-603 3 Springfield MO   522   2026-09-26   
417-604 A Springfield MO SPFDMOMCXVX  522      
417-604 4 Springfield MO   522   2026-09-26   
417-604 5 Springfield MO   522   2026-09-26   
417-604 6 Springfield MO   522   2026-09-26   
417-604 8 Springfield MO SPFDMOMCXVX  522   2023-05-11   
417-604 9 Springfield MO SPFDMOMCXVX  522   2023-05-11   
417-618 6 Springfield MO SPFDMOMCXVX  522   2025-11-14   
417-618 7 Springfield MO SPFDMOMCXVX  522   2025-11-14   
423-993 A Chattanooga TN CHTGTNNS07Z  472   2026-01-22   
423-993 6 Chattanooga TN CHTGTNNS07Z  472   2026-01-22   
423-993 7 Chattanooga TN CHTGTNNS07Z  472   2026-01-22   
423-993 8 Chattanooga TN CHTGTNNS07Z  472   2026-01-22   
423-993 9 Chattanooga TN CHTGTNNS07Z  472   2026-01-22   
423-995 A Johnson City TN JHCYTNXCX6Z  956   2026-01-22   
423-995 6 Johnson City TN JHCYTNXCX6Z  956   2026-01-22   
423-995 7 Johnson City TN JHCYTNXCX6Z  956   2026-01-22   
423-995 8 Johnson City TN JHCYTNXCX6Z  956   2026-01-22   
423-995 9 Johnson City TN JHCYTNXCX6Z  956   2026-01-22   
424-304 3 Redondo CA LSANCARCY1X  730   2016-06-02   
424-304 5 Redondo CA LSANCARCY1X  730   2016-06-02   
424-304 6 Redondo CA LSANCARCY1X  730   2016-06-02   
424-304 7 Redondo CA LSANCARCY1X  730   2016-06-02   
424-304 8 Redondo CA LSANCARCY1X  730   2016-06-02   
424-304 9 Redondo CA LSANCARCY1X  730   2016-08-27   
424-350 2 Redondo CA LSANCARCY1X  730   2016-08-27   
424-359 4 Beverly Hills CA LSANCARCY1X  730   2016-06-02   
424-359 5 Beverly Hills CA LSANCARCY1X  730   2016-06-02   
424-359 6 Beverly Hills CA LSANCARCY1X  730   2016-06-02   
424-359 7 Beverly Hills CA LSANCARCY1X  730   2016-06-02   
424-359 8 Beverly Hills CA LSANCARCY1X  730   2016-06-02   
424-365 5 West Los Angeles CA LSANCARCY1X  730   2014-08-16   
424-452 3 Redondo CA LSANCARCY1X  730   2016-08-27   
424-452 4 Redondo CA LSANCARCY1X  730   2016-08-27   
424-452 5 Redondo CA LSANCARCY1X  730   2016-08-27   

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Last updated: Tue, 29 Sep 2026 03:00:13 UTC

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