NumberResearchThousands-blocks in 559-876
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 559-876 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 559 blocks
Most active assignees, all time — NPA 559
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-04-12 | 559-876-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | SANGER | CA |
| — | 559-876-1XXX | 1000–1999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | SANGER | CA |
| — | 559-876-2XXX | 2000–2999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | SANGER | CA |
| — | 559-876-3XXX | 3000–3999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | SANGER | CA |
| 2011-09-08 | 559-876-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | SANGER | CA |
| 2007-08-08 | 559-876-5XXX | 5000–5999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SANGER | CA |
| — | 559-876-6XXX | 6000–6999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | SANGER | CA |
| 2020-12-11 | 559-876-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SANGER | CA |
| 2017-03-14 | 559-876-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | SANGER | CA |
| 2024-02-06 | 559-876-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | SANGER | 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.