NumberResearchThousands-blocks in 815-587
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 815-587 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 815 blocks
Most active assignees, all time — NPA 815
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 815-587-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | OTTAWA | IL |
| 2006-09-26 | 815-587-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | OTTAWA | IL |
| 2005-11-15 | 815-587-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | OTTAWA | IL |
| 2010-06-04 | 815-587-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | OTTAWA | IL |
| 2005-11-15 | 815-587-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | OTTAWA | IL |
| 2007-12-03 | 815-587-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | OTTAWA | IL |
| 2005-02-22 | 815-587-6XXX | 6000–6999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | OTTAWA | IL |
| 2014-06-13 | 815-587-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | OTTAWA | IL |
| 2006-07-11 | 815-587-8XXX | 8000–8999 | Assigned | ACCESS ONE, INC. - IL | 5447 | OTTAWA | IL |
| — | 815-587-9XXX | 9000–9999 | Available | OTTAWA | 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.