NumberResearchRecent thousands-block assignments
17 blocks assigned in December 2025 · 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, December 2025 — NPA 406
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-12-19 | 406-517-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LIVINGSTON | MT |
| 2025-12-19 | 406-517-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LIVINGSTON | MT |
| 2025-12-18 | 406-350-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LEWISTOWN | MT |
| 2025-12-18 | 406-391-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CUT BANK | MT |
| 2025-12-18 | 406-482-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SIDNEY | MT |
| 2025-12-11 | 406-790-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CULBERTSON | MT |
| 2025-12-11 | 406-930-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BIG TIMBER | MT |
| 2025-12-11 | 406-935-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BROADUS | MT |
| 2025-12-11 | 406-939-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | W GLENDIVE | MT |
| 2025-12-11 | 406-971-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | PLEVNA | MT |
| 2025-12-11 | 406-973-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SIDNEY | MT |
| 2025-12-11 | 406-974-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CIRCLE | MT |
| 2025-12-11 | 406-975-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | EKALAKA | MT |
| 2025-12-11 | 406-977-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | JORDAN | MT |
| 2025-12-11 | 406-978-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BAKER | MT |
| 2025-12-08 | 406-867-5XXX | 5000–5999 | Assigned | WAVENATION, LLC | 700J | BILLINGS | MT |
| 2025-12-04 | 406-618-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MISSOULA | 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.