NumberResearchThousands-blocks in 509-987
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 509-987 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 |
|---|---|---|---|---|---|---|---|
| — | 509-987-0XXX | 0000–0999 | Reserved | UNITED STATES CELLULAR - WA | 6270 | KENNEWICK | WA |
| 2010-05-17 | 509-987-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | KENNEWICK | WA |
| 2006-09-05 | 509-987-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KENNEWICK | WA |
| 2007-09-25 | 509-987-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KENNEWICK | WA |
| 2007-09-25 | 509-987-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KENNEWICK | WA |
| 2009-01-05 | 509-987-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | KENNEWICK | WA |
| 2009-01-21 | 509-987-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | KENNEWICK | WA |
| 2009-01-29 | 509-987-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KENNEWICK | WA |
| 2009-02-05 | 509-987-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | KENNEWICK | WA |
| 2009-05-13 | 509-987-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | KENNEWICK | WA |
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.