NumberResearchRecent thousands-block assignments
21 blocks assigned in August 2026 · 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, August 2026 — NPA 406
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-08-26 | 406-447-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HELENA | MT |
| 2026-08-18 | 406-557-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | JORDAN | MT |
| 2026-08-18 | 406-772-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | PLEVNA | MT |
| 2026-08-18 | 406-775-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | EKALAKA | MT |
| 2026-08-18 | 406-891-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BAKER | MT |
| 2026-08-18 | 406-930-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BIG TIMBER | MT |
| 2026-08-18 | 406-974-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CIRCLE | MT |
| 2026-08-18 | 406-989-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | W GLENDIVE | MT |
| 2026-08-14 | 406-757-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | DECKER | 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 | 406-621-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | FORTBENTON | MT |
| 2026-08-13 | 406-677-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | SEELEYLAKE | MT |
| 2026-08-13 | 406-760-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | GREATFALLS | MT |
| 2026-08-04 | 406-233-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | MILES CITY | MT |
| 2026-08-04 | 406-318-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BILLINGS | MT |
| 2026-08-04 | 406-425-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | RED LODGE | MT |
| 2026-08-04 | 406-815-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | RED LODGE | MT |
| 2026-08-04 | 406-953-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | HARDIN | MT |
| 2026-08-04 | 406-973-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | SIDNEY | MT |
| 2026-08-04 | 406-997-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | FROMBERG | 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.