NumberResearchRecent thousands-block assignments
7 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/22/2026
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 |
|---|---|---|---|---|---|---|---|
| 2026-09-17 | 406-517-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | LIVINGSTON | MT |
| 2026-09-17 | 406-520-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ABSAROKEE | MT |
| 2026-09-17 | 406-665-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | HARDIN | MT |
| 2026-09-17 | 406-815-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | RED LODGE | MT |
| 2026-09-17 | 406-940-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | MOLT | MT |
| 2026-09-17 | 406-997-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | FROMBERG | MT |
| 2026-09-08 | 406-371-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2026-08-13 | 406-373-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2026-08-13 | 406-517-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | LIVINGSTON | MT |
| 2026-08-13 | 406-760-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | GREATFALLS | MT |
| 2026-04-15 | 406-929-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNGRYHORS | MT |
| 2026-04-03 | 406-330-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | CLINTON | MT |
| 2026-01-07 | 406-617-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2026-01-07 | 406-831-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2025-11-06 | 406-219-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2025-09-23 | 406-536-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2025-09-12 | 406-955-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | KALISPELL | MT |
| 2025-08-20 | 406-402-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | GREATFALLS | 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 |
| 2025-07-01 | 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 |
| 2025-05-30 | 406-536-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2025-05-21 | 406-610-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | MISSOULA | MT |
| 2025-05-15 | 406-617-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2025-03-07 | 406-617-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2025-01-24 | 406-536-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2025-01-24 | 406-872-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | POLSON | MT |
| 2025-01-07 | 406-593-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | MT |
| 2024-12-16 | 406-593-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | MT |
| 2024-09-24 | 406-387-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNGRYHORS | MT |
| 2024-09-24 | 406-593-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | MT |
| 2024-09-11 | 406-318-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-09-11 | 406-330-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CLINTON | MT |
| 2024-09-11 | 406-373-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-09-11 | 406-517-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | LIVINGSTON | MT |
| 2024-08-28 | 406-475-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HELENA | MT |
| 2024-08-28 | 406-475-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | HELENA | MT |
| 2024-07-12 | 406-993-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BIG SKY | MT |
| 2024-06-25 | 406-651-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-06-25 | 406-760-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | GREATFALLS | MT |
| 2024-06-13 | 406-929-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNGRYHORS | MT |
| 2024-06-11 | 406-310-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | MT |
| 2024-05-31 | 406-991-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | MARION | MT |
| 2024-03-25 | 406-310-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | MT |
| 2024-03-06 | 406-686-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CLYDE PARK | MT |
| 2024-03-06 | 406-936-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CLYDE PARK | MT |
| 2024-02-23 | 406-894-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.