NumberResearchThousands-blocks in 559-787
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 559-787 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-12-07 | 559-787-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TIVYVALLEY | CA |
| 2017-03-15 | 559-787-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | TIVYVALLEY | CA |
| — | 559-787-2XXX | 2000–2999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | TIVYVALLEY | CA |
| — | 559-787-3XXX | 3000–3999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | TIVYVALLEY | CA |
| 2018-03-16 | 559-787-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TIVYVALLEY | CA |
| 2024-12-30 | 559-787-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TIVYVALLEY | CA |
| 2019-11-18 | 559-787-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | TIVYVALLEY | CA |
| 2018-06-15 | 559-787-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | TIVYVALLEY | CA |
| 2025-01-09 | 559-787-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | TIVYVALLEY | CA |
| 2014-10-29 | 559-787-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TIVYVALLEY | 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.