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 283
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 |
|---|---|---|---|---|---|---|---|
| 2026-07-14 | 283-236-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2025-08-20 | 283-210-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2025-07-30 | 283-210-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2025-07-01 | 283-234-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CLERMONT | OH |
| 2025-04-03 | 283-218-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | CLERMONT | OH |
| 2025-04-03 | 283-218-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | CLERMONT | OH |
| 2025-04-03 | 283-234-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CLERMONT | OH |
| 2024-11-12 | 283-225-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-10-16 | 283-210-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2024-10-16 | 283-210-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2024-09-09 | 283-225-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-08-14 | 283-888-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-08-14 | 283-888-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-06-07 | 283-219-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-06-07 | 283-219-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-06-07 | 283-219-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-02-20 | 283-210-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2024-02-20 | 283-210-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2024-02-20 | 283-210-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | MASON | OH |
| 2024-02-20 | 283-215-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-02-20 | 283-215-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
| 2024-02-20 | 283-218-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CLERMONT | OH |
| 2024-02-20 | 283-218-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CLERMONT | OH |
| 2024-02-20 | 283-218-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CLERMONT | OH |
| 2024-02-20 | 283-219-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | HAMILTON | OH |
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.