NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 231
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-08-13 | 231-469-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | MUSKEGON | MI |
| 2025-02-12 | 231-428-5XXX | 5000–5999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | MUSKEGON | MI |
| 2025-02-12 | 231-428-6XXX | 6000–6999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | MUSKEGON | MI |
| 2024-06-11 | 231-834-6XXX | 6000–6999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | GRANT | MI |
| 2024-05-15 | 231-648-7XXX | 7000–7999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | HOWARDCITY | MI |
| 2023-04-18 | 231-370-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | MUSKEGON | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.