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.
Most active assignees, all time — NPA 406
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-04-17 | 406-310-4XXX | 4000–4999 | Assigned | BLACKFOOT COMMUNICATIONS, INC. - MT | 7870 | BUTTE | MT |
| 2013-11-14 | 406-607-4XXX | 4000–4999 | Assigned | BLACKFOOT COMMUNICATIONS, INC. - MT | 7870 | KALISPELL | MT |
| 2013-11-12 | 406-601-4XXX | 4000–4999 | Assigned | BLACKFOOT COMMUNICATIONS, INC. - MT | 7870 | BILLINGS | MT |
| 2013-11-12 | 406-602-4XXX | 4000–4999 | Assigned | BLACKFOOT COMMUNICATIONS, INC. - MT | 7870 | BOZEMAN | MT |
| 2013-11-12 | 406-603-4XXX | 4000–4999 | Assigned | BLACKFOOT COMMUNICATIONS, INC. - MT | 7870 | HELENA | MT |
| 2011-07-15 | 406-604-4XXX | 4000–4999 | Assigned | BLACKFOOT COMMUNICATIONS, INC. - MT | 7870 | GREATFALLS | 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.