NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2019-05-22 406-607-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2019-05-22 406-792-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F BUTTE MT
2019-04-24 406-802-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAMILTON MT
2019-04-19 406-792-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G BUTTE MT
2019-04-17 406-430-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F HELENA MT
2019-04-17 406-637-8XXX 8000–8999Assigned AIRUS, INC. - MT 588H TERRY MT
2019-04-11 406-925-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G DILLON MT
2019-04-05 406-312-1XXX 1000–1999Assigned AIRUS, INC. - MT 588H BOZEMAN MT
2019-04-05 406-998-2XXX 2000–2999Assigned AIRUS, INC. - MT 588H BILLINGS MT
2019-03-29 406-561-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2019-03-29 406-561-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2019-03-29 406-589-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2019-03-27 406-304-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2019-03-27 406-748-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G COLSTRIP MT
2019-03-27 406-968-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G LEWISTOWN MT
2019-03-27 406-970-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2019-03-14 406-944-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G MILES CITY MT
2019-03-13 406-402-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2019-03-08 406-266-0XXX 0000–0999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TOWNSEND MT
2019-03-08 406-313-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BOULDER MT
2019-03-06 406-919-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J BELGRADE MT
2019-02-20 406-916-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HELENA MT
2019-02-19 406-894-7XXX 7000–7999Assigned MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 BILLINGS MT
2019-02-13 406-624-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOZEMAN MT
2019-01-30 406-500-0XXX 0000–0999Assigned FRACTEL, LLC 965H BILLINGS MT
2019-01-21 406-993-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BIG SKY MT
2019-01-10 406-389-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F HELENA MT
2019-01-10 406-389-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F HELENA MT
2019-01-10 406-389-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F HELENA MT
2019-01-10 406-604-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2019-01-10 406-604-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2019-01-10 406-604-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2019-01-08 406-521-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 TOWNSEND MT
2019-01-07 406-309-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2019-01-07 406-309-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2018-12-12 406-417-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HELENA MT
2018-12-11 406-309-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KALISPELL MT
2018-12-06 406-312-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2018-12-06 406-312-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2018-11-28 406-902-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 SHERIDAN MT
2018-11-27 406-909-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COLUMBIFLS MT
2018-11-19 406-939-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 W GLENDIVE MT
2018-11-07 406-292-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 JOPLIN MT
2018-11-07 406-304-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2018-11-07 406-394-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 NORTHHAVRE MT
2018-11-07 406-632-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HARLOWTON MT
2018-10-29 406-953-8XXX 8000–8999Assigned SAGEBRUSH CELLULAR, INC. 443B HARDIN MT
2018-10-29 406-953-9XXX 9000–9999Assigned SAGEBRUSH CELLULAR, INC. 443B HARDIN MT
2018-10-26 406-301-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MALTA MT
2018-10-26 406-305-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 WHSLPHRSPG MT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.