NumberResearchThousands-blocks in 563-856
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 563-856 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 563 blocks
Most active assignees, all time — NPA 563
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-03-24 | 563-856-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | COLESBURG | IA |
| — | 563-856-1XXX | 1000–1999 | Reserved | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | COLESBURG | IA |
| — | 563-856-2XXX | 2000–2999 | Reserved | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | COLESBURG | IA |
| — | 563-856-3XXX | 3000–3999 | Reserved | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | COLESBURG | IA |
| — | 563-856-4XXX | 4000–4999 | Reserved | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | COLESBURG | IA |
| — | 563-856-5XXX | 5000–5999 | Reserved | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | COLESBURG | IA |
| 2021-02-15 | 563-856-6XXX | 6000–6999 | Assigned | ONVOY, LLC - IA | 221F | COLESBURG | IA |
| — | 563-856-7XXX | 7000–7999 | Assigned (pending) | COLESBURG | IA | ||
| 2021-02-15 | 563-856-8XXX | 8000–8999 | Assigned | ONVOY, LLC - IA | 221F | COLESBURG | IA |
| — | 563-856-9XXX | 9000–9999 | Reserved | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | COLESBURG | IA |
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.