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
2012-11-13 406-204-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F HELENA MT
2012-11-13 406-204-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F HELENA MT
2012-11-13 406-221-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F BUTTE MT
2012-11-13 406-221-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F BUTTE MT
2012-11-13 406-221-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BUTTE MT
2012-11-13 406-221-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BUTTE MT
2012-11-13 406-225-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BOULDER MT
2012-11-13 406-315-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2012-11-13 406-315-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2012-11-13 406-315-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2012-11-13 406-315-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2012-11-13 406-420-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2012-11-13 406-420-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2012-11-13 406-420-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2012-11-13 406-468-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F CASCADE MT
2012-11-13 406-631-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F ELMO MT
2012-11-13 406-631-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F ELMO MT
2012-11-13 406-631-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F ELMO MT
2012-11-13 406-660-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F DILLON MT
2012-11-13 406-660-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F DILLON MT
2012-11-13 406-660-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F DILLON MT
2012-11-13 406-660-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F DILLON MT
2012-11-13 406-821-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F DARBY MT
2012-11-13 406-879-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F HAVRE MT
2012-11-13 406-879-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F HAVRE MT
2012-11-13 406-879-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F HAVRE MT
2012-11-13 406-879-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F HAVRE MT
2012-11-09 406-298-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E COLUMBUS MT
2012-10-24 406-845-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CUT BANK MT
2012-10-03 406-589-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2012-10-03 406-702-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2012-10-03 406-702-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2012-10-03 406-836-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2012-09-24 406-944-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MILES CITY MT
2012-09-20 406-361-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAMILTON MT
2012-09-13 406-852-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MILES CITY MT
2012-09-10 406-309-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2012-09-10 406-475-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2012-09-10 406-830-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2012-09-10 406-830-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2012-08-28 406-720-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLSTRIP MT
2012-08-24 406-702-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2012-08-24 406-702-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2012-08-24 406-702-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2012-08-24 406-702-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2012-08-24 406-830-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2012-08-16 406-540-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2012-08-14 406-309-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2012-08-14 406-426-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RED LODGE MT
2012-08-14 406-702-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS 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.