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
406-719 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      

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

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