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 561
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-04-25 | 561-605-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BOCA RATON | FL |
| 2025-04-25 | 561-605-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | BOCA RATON | FL |
| 2025-04-25 | 561-606-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | DELRAY BCH | FL |
| 2025-04-25 | 561-606-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | DELRAY BCH | FL |
| 2025-04-25 | 561-813-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | PAHOKEE | FL |
| 2025-04-25 | 561-813-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | PAHOKEE | FL |
| 2022-09-14 | 561-407-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | DELRAY BCH | FL |
| 2022-09-14 | 561-407-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | DELRAY BCH | FL |
| 2022-09-14 | 561-769-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BOYNTONBCH | FL |
| 2022-09-14 | 561-794-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PAHOKEE | FL |
| 2022-09-14 | 561-794-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | PAHOKEE | FL |
| 2022-09-12 | 561-872-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BOCA RATON | FL |
| 2022-09-12 | 561-879-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | BELLEGLADE | FL |
| 2022-09-12 | 561-879-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | BELLEGLADE | FL |
| 2021-08-12 | 561-673-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BELLEGLADE | FL |
| 2021-08-12 | 561-695-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | DELRAY BCH | FL |
| 2021-08-12 | 561-971-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WPALMBEACH | FL |
| 2021-04-23 | 561-589-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | JUPITER | FL |
| 2021-04-23 | 561-645-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | PAHOKEE | FL |
| 2021-04-23 | 561-778-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BOYNTONBCH | FL |
| 2017-11-17 | 561-286-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BELLEGLADE | FL |
| 2017-11-16 | 561-264-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | PAHOKEE | FL |
| 2017-06-07 | 561-815-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | WPALMBEACH | FL |
| 2017-06-06 | 561-344-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | DELRAY BCH | FL |
| 2017-06-06 | 561-569-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | BOCA RATON | FL |
| 2017-06-06 | 561-658-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | JUPITER | FL |
| 2017-06-06 | 561-903-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BOYNTONBCH | FL |
| 2013-07-29 | 561-557-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WPALMBEACH | FL |
| 2013-04-16 | 561-270-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | DELRAY BCH | FL |
| 2013-03-22 | 561-413-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BOYNTONBCH | FL |
| 2013-03-18 | 561-320-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | JUPITER | FL |
| 2013-03-18 | 561-342-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | PAHOKEE | 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.