NumberResearchThousands-blocks in 309-775
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 309-775 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 |
|---|---|---|---|---|---|---|---|
| 2010-05-20 | 309-775-0XXX | 0000–0999 | Assigned | MCC TELEPHONY LLC | 593K | PRAIRIE CY | IL |
| — | 309-775-1XXX | 1000–1999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | PRAIRIE CY | IL |
| 2021-07-14 | 309-775-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | PRAIRIE CY | IL |
| 2023-06-29 | 309-775-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | PRAIRIE CY | IL |
| — | 309-775-4XXX | 4000–4999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | PRAIRIE CY | IL |
| 2021-03-11 | 309-775-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | PRAIRIE CY | IL |
| 2023-02-06 | 309-775-6XXX | 6000–6999 | Assigned | MTC COMMUNICATIONS, INC. - IL | 342F | PRAIRIE CY | IL |
| 2014-06-25 | 309-775-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | PRAIRIE CY | IL |
| 2020-01-27 | 309-775-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | PRAIRIE CY | IL |
| 2021-01-30 | 309-775-9XXX | 9000–9999 | Assigned | STRATUS NETWORKS | 495J | PRAIRIE CY | IL |
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.