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
2019-08-16 406-742-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F FAIRVIEW MT
2019-08-16 406-742-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F FAIRVIEW MT
2019-08-16 406-780-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F COLUMBUS MT
2019-08-16 406-780-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F COLUMBUS MT
2019-08-16 406-796-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F WIBAUX MT
2019-08-16 406-796-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F WIBAUX MT
2019-08-16 406-812-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F LAUREL MT
2019-08-16 406-820-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F OLNEY MT
2019-08-16 406-840-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F SILVERTIP MT
2019-08-16 406-840-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F SILVERTIP MT
2019-08-16 406-844-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F LAKESIDE MT
2019-08-16 406-857-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F SOMERS MT
2019-08-16 406-857-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F SOMERS MT
2019-08-16 406-858-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2019-08-16 406-863-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F WHITEFISH MT
2019-08-16 406-873-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F CUT BANK MT
2019-08-16 406-888-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F W GLACIER MT
2019-08-16 406-905-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F JOLIET MT
2019-08-16 406-905-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F JOLIET MT
2019-08-16 406-909-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F COLUMBIFLS MT
2019-08-16 406-920-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2019-08-16 406-926-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2019-08-16 406-936-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F CLYDE PARK MT
2019-08-16 406-944-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F MILES CITY MT
2019-08-16 406-946-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F LIVINGSTON MT
2019-08-16 406-957-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F TERRY MT
2019-08-16 406-957-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F TERRY MT
2019-08-16 406-987-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F GLENDIVE MT
2019-08-16 406-987-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F GLENDIVE MT
2019-08-16 406-991-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F MARION MT
2019-08-15 406-310-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BUTTE MT
2019-08-07 406-998-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2019-08-01 406-317-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G MISSOULA MT
2019-07-30 406-320-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ROUNDUP MT
2019-07-30 406-500-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BILLINGS MT
2019-07-30 406-974-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 CIRCLE MT
2019-07-17 406-499-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2019-07-16 406-691-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ANACONDA MT
2019-07-03 406-607-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2019-06-20 406-499-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2019-06-12 406-521-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 TOWNSEND MT
2019-06-10 406-602-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2019-06-10 406-606-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2019-06-10 406-606-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2019-06-04 406-302-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 WOLF CREEK MT
2019-05-29 406-401-2XXX 2000–2999Assigned CSC WIRELESS, LLC 425J GREATFALLS MT
2019-05-29 406-409-2XXX 2000–2999Assigned CSC WIRELESS, LLC 425J BILLINGS MT
2019-05-22 406-540-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2019-05-22 406-540-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2019-05-22 406-607-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F KALISPELL 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.