NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · 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, all time — NPA 313
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-06-02 | 313-620-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN3 | MI |
| 2026-03-05 | 313-449-0XXX | 0000–0999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN2 | MI |
| 2026-03-05 | 313-825-0XXX | 0000–0999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN2 | MI |
| 2026-03-05 | 313-825-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN2 | MI |
| 2026-02-02 | 313-616-6XXX | 6000–6999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN1 | MI |
| 2026-02-02 | 313-616-7XXX | 7000–7999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN1 | MI |
| 2026-02-02 | 313-616-8XXX | 8000–8999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN1 | MI |
| 2025-12-30 | 313-857-0XXX | 0000–0999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2025-12-30 | 313-857-1XXX | 1000–1999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2025-12-30 | 313-857-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2025-12-30 | 313-857-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2025-08-04 | 313-344-8XXX | 8000–8999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN2 | MI |
| 2025-08-04 | 313-708-6XXX | 6000–6999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN2 | MI |
| 2025-06-23 | 313-750-5XXX | 5000–5999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN4 | MI |
| 2025-06-23 | 313-750-6XXX | 6000–6999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN4 | MI |
| 2025-05-22 | 313-785-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2025-05-22 | 313-785-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2025-05-22 | 313-785-5XXX | 5000–5999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2025-04-02 | 313-620-0XXX | 0000–0999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN3 | MI |
| 2025-04-02 | 313-620-1XXX | 1000–1999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN3 | MI |
| 2024-07-30 | 313-750-1XXX | 1000–1999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN4 | MI |
| 2024-07-30 | 313-762-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN1 | MI |
| 2024-06-18 | 313-548-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN2 | MI |
| 2024-06-18 | 313-925-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN2 | MI |
| 2024-06-11 | 313-741-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2024-06-11 | 313-741-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2024-05-15 | 313-519-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN3 | MI |
| 2023-06-12 | 313-726-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
| 2023-06-12 | 313-787-7XXX | 7000–7999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | DETROITZN6 | MI |
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.