NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 406
T-MOBILE USA, INC. 7
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 2
NEW CINGULAR WIRELESS PCS, LLC 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2014-01-10 406-858-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2014-01-10 406-897-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLUMBIFLS MT
2013-12-31 406-589-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2013-12-13 406-210-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2013-12-13 406-800-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BRIDGER MT
2013-12-13 406-800-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BRIDGER MT
2013-12-13 406-966-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SHELBY MT
2013-12-06 406-361-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HAMILTON MT
2013-11-14 406-607-4XXX 4000–4999Assigned BLACKFOOT COMMUNICATIONS, INC. - MT 7870 KALISPELL MT
2013-11-13 406-201-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E FORSYTH MT
2013-11-12 406-534-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2013-11-12 406-534-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2013-11-12 406-601-4XXX 4000–4999Assigned BLACKFOOT COMMUNICATIONS, INC. - MT 7870 BILLINGS MT
2013-11-12 406-602-4XXX 4000–4999Assigned BLACKFOOT COMMUNICATIONS, INC. - MT 7870 BOZEMAN MT
2013-11-12 406-603-4XXX 4000–4999Assigned BLACKFOOT COMMUNICATIONS, INC. - MT 7870 HELENA MT
2013-11-08 406-927-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2013-11-07 406-702-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2013-10-17 406-836-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2013-10-16 406-730-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K WHITEFISH MT
2013-10-16 406-926-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MISSOULA MT
2013-09-19 406-389-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HELENA MT
2013-09-16 406-478-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
2013-09-04 406-726-1XXX 1000–1999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F ARLEE MT
2013-08-20 406-371-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BILLINGS MT
2013-08-19 406-747-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F FAIRVIEW MT
2013-08-13 406-468-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CASCADE MT
2013-07-29 406-644-1XXX 1000–1999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F CHARLO MT
2013-07-29 406-826-1XXX 1000–1999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F PLAINS MT
2013-07-19 406-300-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K KALISPELL MT
2013-06-24 406-615-2XXX 2000–2999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F THOMPSNFLS MT
2013-06-24 406-631-4XXX 4000–4999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F ELMO MT
2013-05-28 406-209-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2013-05-28 406-662-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BRIDGER MT
2013-04-30 406-404-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2013-04-30 406-823-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2013-04-18 406-630-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
2013-04-18 406-942-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GLASGOW MT
2013-03-01 406-879-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAVRE MT
2013-02-22 406-770-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G GREATFALLS MT
2013-02-12 406-309-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2013-02-12 406-309-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2013-02-12 406-317-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2013-02-12 406-317-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2013-02-12 406-334-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
2013-02-12 406-475-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2013-02-12 406-475-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2013-02-12 406-479-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BUTTE MT
2013-02-12 406-876-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2013-02-12 406-876-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2013-02-12 406-876-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.