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 571
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-12-02 | 571-394-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | TRIANGLE | VA |
| 2024-12-02 | 571-394-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | TRIANGLE | VA |
| 2024-12-02 | 571-600-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | DULLESMTRO | VA |
| 2024-12-02 | 571-600-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | DULLESMTRO | VA |
| 2024-12-02 | 571-676-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | MANASSAS | VA |
| 2024-12-02 | 571-676-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | MANASSAS | VA |
| 2024-12-02 | 571-712-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LEESBURG | VA |
| 2024-12-02 | 571-712-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | LEESBURG | VA |
| 2024-12-02 | 571-713-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | OCCOQUAN | VA |
| 2024-12-02 | 571-713-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | OCCOQUAN | VA |
| 2024-12-02 | 571-714-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN08 | VA |
| 2024-12-02 | 571-714-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN08 | VA |
| 2024-11-27 | 571-374-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | INDENDNTHL | VA |
| 2024-11-27 | 571-491-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | DULLES | VA |
| 2024-11-27 | 571-636-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | HAYMARKET | VA |
| 2024-11-27 | 571-636-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | HAYMARKET | VA |
| 2024-11-27 | 571-674-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | BRADDOCK | VA |
| 2024-11-27 | 571-674-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | BRADDOCK | VA |
| 2024-11-27 | 571-696-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ENGLESIDE | VA |
| 2024-11-27 | 571-696-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | ENGLESIDE | VA |
| 2024-11-27 | 571-698-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ARCOLA | VA |
| 2024-11-27 | 571-698-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | ARCOLA | VA |
| 2024-11-27 | 571-702-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | DALE CITY | VA |
| 2024-11-27 | 571-702-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | DALE CITY | VA |
| 2024-11-27 | 571-704-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NOKESVILLE | VA |
| 2024-11-27 | 571-704-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | NOKESVILLE | VA |
| 2024-11-27 | 571-705-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN17 | VA |
| 2024-11-27 | 571-705-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN17 | VA |
| 2024-11-27 | 571-727-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | LORTON | VA |
| 2024-11-27 | 571-727-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | LORTON | VA |
| 2024-11-27 | 571-746-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | DULLES | VA |
| 2024-11-27 | 571-877-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | LORTONMTRO | VA |
| 2024-11-27 | 571-998-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | INDENDNTHL | VA |
| 2024-06-07 | 571-679-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN17 | VA |
| 2024-06-07 | 571-679-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN17 | VA |
| 2024-06-05 | 571-573-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | NOKESVILLE | VA |
| 2024-06-05 | 571-573-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | NOKESVILLE | VA |
| 2024-06-05 | 571-628-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | DALE CITY | VA |
| 2024-06-05 | 571-628-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | DALE CITY | VA |
| 2024-06-05 | 571-650-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | ARCOLA | VA |
| 2024-06-05 | 571-671-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ENGLESIDE | VA |
| 2024-06-05 | 571-671-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ENGLESIDE | VA |
| 2024-06-05 | 571-674-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BRADDOCK | VA |
| 2024-06-05 | 571-674-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BRADDOCK | VA |
| 2024-06-05 | 571-688-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | INDENDNTHL | VA |
| 2024-06-05 | 571-688-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | INDENDNTHL | VA |
| 2024-06-05 | 571-727-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | LORTON | VA |
| 2024-06-05 | 571-727-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LORTON | VA |
| 2024-06-05 | 571-746-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | DULLES | VA |
| 2024-06-05 | 571-746-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | DULLES | VA |
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.