NumberResearchThousands-blocks in 309-487
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 309-487 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 309 blocks
Most active assignees, all time — NPA 309
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 309-487-0XXX | 0000–0999 | Available | DOWNS | IL | ||
| 2020-06-12 | 309-487-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | DOWNS | IL |
| 2021-02-02 | 309-487-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | DOWNS | IL |
| 2021-03-05 | 309-487-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | DOWNS | IL |
| 2018-11-27 | 309-487-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | DOWNS | IL |
| 2024-01-11 | 309-487-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | DOWNS | IL |
| 2021-06-08 | 309-487-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | DOWNS | IL |
| 2014-07-08 | 309-487-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DOWNS | IL |
| 2019-06-18 | 309-487-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | DOWNS | IL |
| 2019-06-18 | 309-487-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | DOWNS | IL |
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.