NumberResearchThousands-blocks in 509-287
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 509-287 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 509 blocks
Most active assignees, all time — NPA 509
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-06-25 | 509-287-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | FARMINGTON | WA |
| 2016-02-11 | 509-287-1XXX | 1000–1999 | Assigned | ONVOY, LLC - WA | 483E | FARMINGTON | WA |
| — | 509-287-2XXX | 2000–2999 | Reserved | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | FARMINGTON | WA |
| 2008-05-30 | 509-287-3XXX | 3000–3999 | Assigned | ELTOPIA COMMUNICATIONS, LLC - WA | 663D | FARMINGTON | WA |
| 2021-06-01 | 509-287-4XXX | 4000–4999 | Assigned | ONVOY, LLC - WA | 483E | FARMINGTON | WA |
| — | 509-287-5XXX | 5000–5999 | Available | FARMINGTON | WA | ||
| 2014-12-26 | 509-287-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | FARMINGTON | WA |
| 2007-03-23 | 509-287-7XXX | 7000–7999 | Assigned | ONVOY, LLC - WA | 483E | FARMINGTON | WA |
| 2021-10-25 | 509-287-8XXX | 8000–8999 | Assigned | ONVOY, LLC - WA | 483E | FARMINGTON | WA |
| — | 509-287-9XXX | 9000–9999 | Available | FARMINGTON | WA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.