NumberResearchThousands-blocks in 815-230
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 815-230 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 |
|---|---|---|---|---|---|---|---|
| — | 815-230-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | PLAINFIELD | IL |
| 2004-07-07 | 815-230-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | PLAINFIELD | IL |
| 2004-08-24 | 815-230-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | PLAINFIELD | IL |
| 2004-12-09 | 815-230-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | PLAINFIELD | IL |
| 2005-05-31 | 815-230-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | PLAINFIELD | IL |
| 2005-02-08 | 815-230-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | PLAINFIELD | IL |
| 2005-12-22 | 815-230-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | PLAINFIELD | IL |
| — | 815-230-7XXX | 7000–7999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | PLAINFIELD | IL |
| 2005-12-29 | 815-230-8XXX | 8000–8999 | Assigned | ACCESS ONE, INC. - IL | 5447 | PLAINFIELD | IL |
| — | 815-230-9XXX | 9000–9999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | PLAINFIELD | 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.