NumberResearchThousands-blocks in 509-620
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 509-620 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 |
|---|---|---|---|---|---|---|---|
| — | 509-620-0XXX | 0000–0999 | Reserved | ONVOY, LLC - WA | 483E | COULEE DAM | WA |
| — | 509-620-1XXX | 1000–1999 | Reserved | ONVOY, LLC - WA | 483E | COULEE DAM | WA |
| 2015-12-21 | 509-620-2XXX | 2000–2999 | Assigned | ONVOY, LLC - WA | 483E | COULEE DAM | WA |
| 2016-02-04 | 509-620-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | COULEE DAM | WA |
| 2016-09-26 | 509-620-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | COULEE DAM | WA |
| 2016-09-26 | 509-620-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | COULEE DAM | WA |
| 2016-09-26 | 509-620-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | COULEE DAM | WA |
| 2015-10-30 | 509-620-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | COULEE DAM | WA |
| 2019-05-06 | 509-620-8XXX | 8000–8999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | COULEE DAM | WA |
| 2016-03-07 | 509-620-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF WASHINGTON, LLC - WA | 159F | COULEE DAM | 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.