NumberResearchThousands-blocks in 509-350
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 509-350 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 |
|---|---|---|---|---|---|---|---|
| — | 509-350-0XXX | 0000–0999 | Reserved | T-MOBILE USA, INC. | 6529 | MOSES LAKE | WA |
| 2006-01-26 | 509-350-1XXX | 1000–1999 | Assigned | ELTOPIA COMMUNICATIONS, LLC - WA | 663D | MOSES LAKE | WA |
| 2010-06-25 | 509-350-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | MOSES LAKE | WA |
| 2014-08-28 | 509-350-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MOSES LAKE | WA |
| 2016-02-01 | 509-350-4XXX | 4000–4999 | Assigned | ONVOY, LLC - WA | 483E | MOSES LAKE | WA |
| 2006-09-18 | 509-350-5XXX | 5000–5999 | Assigned | ONVOY, LLC - WA | 483E | MOSES LAKE | WA |
| 2015-06-09 | 509-350-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | MOSES LAKE | WA |
| 2015-06-09 | 509-350-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | MOSES LAKE | WA |
| 2008-05-07 | 509-350-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | MOSES LAKE | WA |
| 2007-01-12 | 509-350-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | MOSES LAKE | 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.