NumberResearchThousands-blocks in 309-489
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 309-489 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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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-03-04 | 309-489-0XXX | 0000–0999 | Assigned | MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | GENESEO | IL |
| 2025-04-01 | 309-489-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | GENESEO | IL |
| 2024-07-16 | 309-489-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | GENESEO | IL |
| 2020-04-15 | 309-489-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | GENESEO | IL |
| 2005-12-01 | 309-489-4XXX | 4000–4999 | Assigned | MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | GENESEO | IL |
| 2019-10-04 | 309-489-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | GENESEO | IL |
| 2003-10-22 | 309-489-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | GENESEO | IL |
| 2019-03-07 | 309-489-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | GENESEO | IL |
| 2019-03-07 | 309-489-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | GENESEO | IL |
| 2009-08-04 | 309-489-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | GENESEO | 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.