NumberResearchThousands-blocks in 815-582
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 815-582 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-10-11 | 815-582-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | JOLIET | IL |
| 2014-05-27 | 815-582-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | JOLIET | IL |
| 2016-09-23 | 815-582-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | JOLIET | IL |
| 2006-02-23 | 815-582-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | JOLIET | IL |
| 2006-02-23 | 815-582-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | JOLIET | IL |
| 2006-03-14 | 815-582-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | JOLIET | IL |
| 2006-07-06 | 815-582-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | JOLIET | IL |
| 2006-07-06 | 815-582-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | JOLIET | IL |
| 2006-07-06 | 815-582-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | JOLIET | IL |
| 2006-05-26 | 815-582-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | JOLIET | 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.