NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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.
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-01-14 | 406-610-7XXX | 7000–7999 | Assigned | NUSO, LLC | 732J | MISSOULA | MT |
| 2024-12-31 | 406-617-0XXX | 0000–0999 | Assigned | NUSO, LLC | 732J | BILLINGS | MT |
| 2024-12-31 | 406-617-1XXX | 1000–1999 | Assigned | NUSO, LLC | 732J | BILLINGS | MT |
| 2023-11-15 | 406-574-5XXX | 5000–5999 | Assigned | NUSO, LLC | 478J | SILVERTIP | MT |
| 2023-11-15 | 406-574-6XXX | 6000–6999 | Assigned | NUSO, LLC | 478J | SILVERTIP | MT |
| 2023-11-15 | 406-898-6XXX | 6000–6999 | Assigned | NUSO, LLC | 478J | BOZEMAN | MT |
| 2023-06-13 | 406-679-7XXX | 7000–7999 | Assigned | NUSO, LLC | 732J | HARDIN | MT |
| 2023-03-01 | 406-878-2XXX | 2000–2999 | Assigned | NUSO, LLC | 732J | GREATFALLS | MT |
| 2023-02-08 | 406-550-4XXX | 4000–4999 | Assigned | NUSO, LLC | 732J | MISSOULA | MT |
| 2022-08-31 | 406-325-1XXX | 1000–1999 | Assigned | NUSO, LLC | 732J | BILLINGS | MT |
| 2020-09-11 | 406-574-8XXX | 8000–8999 | Assigned | NUSO, LLC | 478J | SILVERTIP | MT |
| 2020-05-26 | 406-312-2XXX | 2000–2999 | Assigned | NUSO, LLC | 478J | BOZEMAN | MT |
| 2017-09-18 | 406-970-1XXX | 1000–1999 | Assigned | NUSO, LLC | 551G | 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.