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 728
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-04-25 | 728-221-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | JUPITER | FL |
| 2025-04-25 | 728-237-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WPALMBEACH | FL |
| 2025-04-25 | 728-237-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | WPALMBEACH | FL |
| 2025-04-25 | 728-288-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | BOYNTONBCH | FL |
| 2025-04-25 | 728-333-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | JUPITER | FL |
| 2025-04-18 | 728-215-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | BELLEGLADE | FL |
| 2025-04-18 | 728-215-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | BELLEGLADE | FL |
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.