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 703
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-11-27 | 703-775-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | LORTONMTRO | VA |
| 2024-05-31 | 703-381-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | LEESBURG | VA |
| 2024-05-31 | 703-381-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | LEESBURG | VA |
| 2024-05-31 | 703-804-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HERNDON | VA |
| 2024-05-31 | 703-804-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HERNDON | VA |
| 2021-07-28 | 703-722-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | ARCOLA | VA |
| 2017-06-15 | 703-688-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | LORTON | VA |
| 2017-06-15 | 703-826-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | HERNDON | VA |
| 2017-06-15 | 703-952-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ENGLESIDE | VA |
| 2016-11-21 | 703-721-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN08 | VA |
| 2016-11-21 | 703-921-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN08 | VA |
| 2015-02-19 | 703-775-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | LORTONMTRO | VA |
| 2015-02-19 | 703-972-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | DULLESMTRO | VA |
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.