NumberResearchThousands-blocks in 309-536
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 309-536 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 |
|---|---|---|---|---|---|---|---|
| — | 309-536-0XXX | 0000–0999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | MONMOUTH | IL |
| — | 309-536-1XXX | 1000–1999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | MONMOUTH | IL |
| — | 309-536-2XXX | 2000–2999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | MONMOUTH | IL |
| 2011-02-18 | 309-536-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | MONMOUTH | IL |
| — | 309-536-4XXX | 4000–4999 | Available | MONMOUTH | IL | ||
| — | 309-536-5XXX | 5000–5999 | Available | MONMOUTH | IL | ||
| 2017-10-05 | 309-536-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | MONMOUTH | IL |
| 2014-03-17 | 309-536-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MONMOUTH | IL |
| — | 309-536-8XXX | 8000–8999 | Available | MONMOUTH | IL | ||
| 2020-01-27 | 309-536-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | MONMOUTH | 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.