NumberResearchRecent thousands-block assignments
10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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
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
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-09-12 | 406-744-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | STIGNATIUS | MT |
| 2025-09-12 | 406-833-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | RONAN | MT |
| 2025-09-12 | 406-933-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | HELENA | MT |
| 2025-09-12 | 406-955-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | KALISPELL | MT |
| 2025-09-12 | 406-990-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | LAME DEER | MT |
| 2025-09-10 | 406-382-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SUPERIOR | MT |
| 2025-09-10 | 406-489-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | SIDNEY | MT |
| 2025-09-10 | 406-638-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HARDIN | MT |
| 2025-09-10 | 406-853-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MILES CITY | MT |
| 2025-09-02 | 406-870-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | GREATFALLS | MT |
| 2025-08-20 | 406-402-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | GREATFALLS | MT |
| 2025-08-20 | 406-536-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BOZEMAN | MT |
| 2025-08-20 | 406-536-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BOZEMAN | MT |
| 2025-08-20 | 406-536-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | BOZEMAN | MT |
| 2025-08-19 | 406-440-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HELENA | MT |
| 2025-08-19 | 406-707-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | LEWISTOWN | MT |
| 2025-08-07 | 406-731-0XXX | 0000–0999 | Assigned | WAVENATION, LLC | 700J | GREATFALLS | MT |
| 2025-08-05 | 406-228-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GLASGOW | MT |
| 2025-08-05 | 406-318-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BILLINGS | MT |
| 2025-08-05 | 406-331-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ROUNDUP | MT |
| 2025-08-05 | 406-343-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | WYOLA | MT |
| 2025-08-05 | 406-448-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | NO POPLAR | MT |
| 2025-08-05 | 406-464-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ROY | MT |
| 2025-08-05 | 406-484-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CROOKEDCRK | MT |
| 2025-08-05 | 406-520-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ABSAROKEE | MT |
| 2025-08-05 | 406-688-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SCOBEY | MT |
| 2025-08-05 | 406-769-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BAINVILLE | MT |
| 2025-08-05 | 406-773-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | RICHEY | MT |
| 2025-08-05 | 406-779-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | FLAXVLRURL | MT |
| 2025-08-05 | 406-785-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | NO NASHUA | MT |
| 2025-08-05 | 406-828-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ALZADA | MT |
| 2025-08-05 | 406-914-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | LAMBERT | MT |
| 2025-08-05 | 406-940-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MOLT | MT |
| 2025-07-30 | 406-610-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MISSOULA | MT |
| 2025-07-28 | 406-325-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2025-07-28 | 406-617-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2025-07-14 | 406-516-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LAUREL | MT |
| 2025-07-01 | 406-610-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | MISSOULA | MT |
| 2025-07-01 | 406-854-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | MARION | MT |
| 2025-06-26 | 406-617-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2025-06-26 | 406-617-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2025-06-16 | 406-708-1XXX | 1000–1999 | Assigned | WIDE VOICE, LLC - MT | 743G | LEWISTOWN | MT |
| 2025-05-30 | 406-536-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2025-05-30 | 406-934-1XXX | 1000–1999 | Assigned | WIDE VOICE, LLC - MT | 743G | MILES CITY | MT |
| 2025-05-21 | 406-610-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | MISSOULA | MT |
| 2025-05-19 | 406-968-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | LEWISTOWN | MT |
| 2025-05-19 | 406-968-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | LEWISTOWN | MT |
| 2025-05-19 | 406-968-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | LEWISTOWN | MT |
| 2025-05-15 | 406-536-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BOZEMAN | MT |
| 2025-05-15 | 406-617-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | 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.