NumberResearchThousands-blocks in 509-337
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 509-337 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 509-337-0XXX | 0000–0999 | Reserved | QWEST CORPORATION | 9638 | WAITSBURG | WA |
| — | 509-337-1XXX | 1000–1999 | Reserved | QWEST CORPORATION | 9638 | WAITSBURG | WA |
| 2014-12-23 | 509-337-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WAITSBURG | WA |
| 2007-03-12 | 509-337-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | WAITSBURG | WA |
| 2007-02-22 | 509-337-4XXX | 4000–4999 | Assigned | ONVOY, LLC - WA | 483E | WAITSBURG | WA |
| 2006-01-27 | 509-337-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | WAITSBURG | WA |
| — | 509-337-6XXX | 6000–6999 | Reserved | QWEST CORPORATION | 9638 | WAITSBURG | WA |
| — | 509-337-7XXX | 7000–7999 | Available | WAITSBURG | WA | ||
| — | 509-337-8XXX | 8000–8999 | Reserved | QWEST CORPORATION | 9638 | WAITSBURG | WA |
| — | 509-337-9XXX | 9000–9999 | Reserved | QWEST CORPORATION | 9638 | WAITSBURG | 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.