NumberResearchThousands-blocks in 559-780
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 559-780 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 559-780-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CORCORAN | CA |
| 2018-03-27 | 559-780-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CORCORAN | CA |
| — | 559-780-2XXX | 2000–2999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CORCORAN | CA |
| — | 559-780-3XXX | 3000–3999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CORCORAN | CA |
| 2015-09-14 | 559-780-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CORCORAN | CA |
| 2015-06-29 | 559-780-5XXX | 5000–5999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CORCORAN | CA |
| 2016-12-06 | 559-780-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CORCORAN | CA |
| 2024-02-07 | 559-780-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | CORCORAN | CA |
| 2009-11-09 | 559-780-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | CORCORAN | CA |
| 2018-06-15 | 559-780-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | CORCORAN | 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.