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 559
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-09-21 | 559-402-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | BURREL | CA |
| 2022-09-21 | 559-402-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BURREL | CA |
| 2022-09-21 | 559-402-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BURREL | CA |
| 2022-09-21 | 559-407-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | FIREBAUGH | CA |
| 2022-09-21 | 559-407-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | FIREBAUGH | CA |
| 2022-09-21 | 559-418-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | HURON | CA |
| 2022-09-21 | 559-422-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | LATON | CA |
| 2022-09-21 | 559-427-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | PIXLEY | CA |
| 2022-09-21 | 559-427-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | PIXLEY | CA |
| 2022-09-21 | 559-428-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | RIVERDALE | CA |
| 2022-09-21 | 559-461-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | SEQUOIA | CA |
| 2022-09-21 | 559-461-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SEQUOIA | CA |
| 2022-09-21 | 559-463-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | STRATFORD | CA |
| 2022-09-21 | 559-463-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | STRATFORD | CA |
| 2022-09-21 | 559-463-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | STRATFORD | CA |
| 2022-09-21 | 559-463-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | STRATFORD | CA |
| 2022-09-21 | 559-465-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | THREERIVRS | CA |
| 2022-09-21 | 559-466-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | TIPTON | CA |
| 2022-09-21 | 559-466-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | TIPTON | CA |
| 2022-09-21 | 559-466-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | TIPTON | CA |
| 2020-11-25 | 559-581-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | FRESNO | CA |
| 2016-04-05 | 559-401-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | AVENAL | CA |
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.