NumberResearchThousands-blocks in 815-388
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 815-388 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-04-03 | 815-388-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | MCHENRY | IL |
| 2009-10-21 | 815-388-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | MCHENRY | IL |
| 2004-04-15 | 815-388-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | MCHENRY | IL |
| 2004-04-15 | 815-388-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | MCHENRY | IL |
| 2008-10-21 | 815-388-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MCHENRY | IL |
| 2005-04-18 | 815-388-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | MCHENRY | IL |
| 2008-10-21 | 815-388-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MCHENRY | IL |
| 2008-10-21 | 815-388-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MCHENRY | IL |
| 2008-07-29 | 815-388-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | MCHENRY | IL |
| 2026-05-11 | 815-388-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MCHENRY | 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.