NumberResearchThousands-blocks in 815-357
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 815-357 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 |
|---|---|---|---|---|---|---|---|
| 2020-08-31 | 815-357-0XXX | 0000–0999 | Assigned | STRATUS NETWORKS | 495J | SENECA | IL |
| — | 815-357-1XXX | 1000–1999 | Reserved | ILLINOIS BELL TEL CO | 9329 | SENECA | IL |
| 2018-05-04 | 815-357-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SENECA | IL |
| — | 815-357-3XXX | 3000–3999 | Available | SENECA | IL | ||
| 2012-03-20 | 815-357-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | SENECA | IL |
| — | 815-357-5XXX | 5000–5999 | Reserved | ILLINOIS BELL TEL CO | 9329 | SENECA | IL |
| — | 815-357-6XXX | 6000–6999 | Reserved | ILLINOIS BELL TEL CO | 9329 | SENECA | IL |
| 2011-12-13 | 815-357-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | SENECA | IL |
| — | 815-357-8XXX | 8000–8999 | Reserved | ILLINOIS BELL TEL CO | 9329 | SENECA | IL |
| — | 815-357-9XXX | 9000–9999 | Available | SENECA | 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.