NumberResearchRecent thousands-block assignments
17 blocks assigned in April 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, April 2026 — NPA 406
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-04-23 | 406-568-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | RYEGATE | MT |
| 2026-04-22 | 406-677-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SEELEYLAKE | MT |
| 2026-04-20 | 406-566-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | STANFORD | MT |
| 2026-04-17 | 406-342-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | HYSHAM | MT |
| 2026-04-17 | 406-429-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | WINNETT | MT |
| 2026-04-15 | 406-929-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNGRYHORS | MT |
| 2026-04-10 | 406-248-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BILLINGS | MT |
| 2026-04-10 | 406-318-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BILLINGS | MT |
| 2026-04-10 | 406-436-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BROADUS | MT |
| 2026-04-10 | 406-557-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | JORDAN | MT |
| 2026-04-10 | 406-775-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | EKALAKA | MT |
| 2026-04-06 | 406-230-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GLASGOW | MT |
| 2026-04-06 | 406-774-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | LAMBERT | MT |
| 2026-04-06 | 406-913-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ROUNDUP | MT |
| 2026-04-06 | 406-940-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MOLT | MT |
| 2026-04-06 | 406-954-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ROY | MT |
| 2026-04-03 | 406-330-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | CLINTON | 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.