Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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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
406-506 A Billings MT BLNGMT93BMD  650      
406-506 1 Billings MT BLNGMT93BMD  650   2020-11-01   
406-506 2 Billings MT BLNGMT93BMD  650   2020-11-01   
406-506 9 Billings MT BLNGMT93BMD  650   2020-07-23   
406-520 A Absarokee MT BLNGMT93BMD  650      
406-520 5 Absarokee MT BLNGMT93BMD  650   2020-09-27   
406-520 6 Absarokee MT BLNGMT93BMD  650   2020-11-01   
406-719 8 Fromberg MT BLNGMT93BMD  650   2020-09-27   
406-812 6 Laurel MT BLNGMT93BMD  650   2020-09-27   
406-812 9 Laurel MT BLNGMT93BMD  650   2020-11-01   
406-968 A Lewistown MT GRFLMTMAWMD  648      
406-968 7 Lewistown MT GRFLMTMAWMD  648   2025-07-15   
406-968 8 Lewistown MT GRFLMTMAWMD  648   2025-07-15   
406-968 9 Lewistown MT GRFLMTMAWMD  648   2025-07-15   
408-360 6 San Jose: South DA CA SNFCCA21XOZ  722   2026-06-17   
408-897 1 San Antonio CA SNFCCA21XOZ  722   2016-06-09   
408-897 2 San Antonio CA SNFCCA21XOZ  722   2016-06-09   
408-897 4 San Antonio CA SNFCCA21XOZ  722   2016-06-09   
408-897 6 San Antonio CA SNFCCA21XOZ  722   2016-06-09   
409-306 A Beaumont TX BUMUTXHM9MD  562      
409-306 8 Beaumont TX BUMUTXHM9MD  562   2023-05-11   
409-306 9 Beaumont TX BUMUTXHM9MD  562   2023-05-11   
409-369 3 Port Arthur TX BUMUTXHM9MD  562   2026-07-02   
409-369 8 Port Arthur TX BUMUTXHM9MD  562   2026-07-02   
409-369 9 Port Arthur TX BUMUTXHM9MD  562   2026-07-02   
410-587 3 Arbutus MD BLTMMDCHXVX  238   2016-05-14   
410-587 4 Arbutus MD BLTMMDCHXVX  238   2016-05-14   
410-587 5 Arbutus MD BLTMMDCHXVX  238   2016-05-14   
410-587 6 Arbutus MD BLTMMDCHXVX  238   2016-05-14   
410-587 8 Arbutus MD BLTMMDCHXVX  238   2016-05-14   
410-587 9 Arbutus MD BLTMMDCHXVX  238   2016-05-14   
412-410 3 Pittsburgh Zone 1 PA PITBPADTXHX  234   2016-05-20   
412-410 4 Pittsburgh Zone 1 PA PITBPADTXHX  234   2016-05-20   
412-410 5 Pittsburgh Zone 1 PA PITBPADTXHX  234   2016-05-20   
412-410 6 Pittsburgh Zone 1 PA PITBPADTXHX  234   2016-05-20   
412-410 8 Pittsburgh Zone 1 PA PITBPADTXHX  234   2016-05-20   
412-410 9 Pittsburgh Zone 1 PA PITBPADTXHX  234   2016-05-20   
412-662 1 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-662 2 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-662 3 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-662 4 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-662 5 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-662 6 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-662 7 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-662 8 Pittsburgh Suburban Zone 22 PA PITBPADTXHX  234   2016-05-20   
412-844 A Pittsburgh Zone 8 PA PITBPADTXHX  234      
412-844 9 Pittsburgh Zone 8 PA PITBPADTXHX  234   2019-05-16   
413-288 A Springfield MA SPFDMAOI9MD  126      
413-288 8 Springfield MA SPFDMAOI9MD  126   2023-05-11   
413-288 9 Springfield MA SPFDMAOI9MD  126   2023-05-11   
413-421 2 Holyoke MA SPFDMAOI9MD  126   2025-11-28   
413-421 3 Holyoke MA SPFDMAOI9MD  126   2025-11-28   
413-421 4 Holyoke MA SPFDMAOI9MD  126   2025-11-28   
413-524 A Springfield MA SPFDMAOI9MD  126   2025-11-22   
413-524 3 Springfield MA SPFDMAOI9MD  126   2025-11-22   
413-524 4 Springfield MA SPFDMAOI9MD  126   2025-11-22   
413-601 A Pittsfield MA SPFDMAOI9MD  126      
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   
413-661 5 Springfield MA   126   2026-11-08   
413-661 6 Springfield MA   126   2026-11-08   
413-661 7 Springfield MA   126   2026-11-08   
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   

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Last updated: Sun, 01 Nov 2026 02:11:49 UTC

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