NumberResearchThousands-blocks in 563-339
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 563-339 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 |
|---|---|---|---|---|---|---|---|
| — | 563-339-0XXX | 0000–0999 | Available | SUMNER | IA | ||
| — | 563-339-1XXX | 1000–1999 | Available | SUMNER | IA | ||
| — | 563-339-2XXX | 2000–2999 | Available | SUMNER | IA | ||
| 2021-04-09 | 563-339-3XXX | 3000–3999 | Assigned | ONVOY, LLC - IA | 221F | SUMNER | IA |
| — | 563-339-4XXX | 4000–4999 | Available | SUMNER | IA | ||
| 2019-11-15 | 563-339-5XXX | 5000–5999 | Assigned | HAWKEYE INTERCONNECT COMPANY - IA | 429J | SUMNER | IA |
| — | 563-339-6XXX | 6000–6999 | Available | SUMNER | IA | ||
| — | 563-339-7XXX | 7000–7999 | Available | SUMNER | IA | ||
| — | 563-339-8XXX | 8000–8999 | Available | SUMNER | IA | ||
| 2015-10-30 | 563-339-9XXX | 9000–9999 | Assigned | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | SUMNER | 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.