NumberResearchThousands-blocks in 563-221
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 563-221 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, last 30 days — NPA 563
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-09-02 | 563-221-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DE WITT | IA |
| 2007-07-12 | 563-221-1XXX | 1000–1999 | Assigned | UNITED STATES CELLULAR - IA | 6266 | DE WITT | IA |
| 2013-04-02 | 563-221-2XXX | 2000–2999 | Assigned | UNITED STATES CELLULAR - IA | 6266 | DE WITT | IA |
| 2014-03-31 | 563-221-3XXX | 3000–3999 | Assigned | UNITED STATES CELLULAR - IA | 6266 | DE WITT | IA |
| 2015-11-25 | 563-221-4XXX | 4000–4999 | Assigned | UNITED STATES CELLULAR - IA | 6266 | DE WITT | IA |
| 2020-09-03 | 563-221-5XXX | 5000–5999 | Assigned | UNITED STATES CELLULAR - IA | 6266 | DE WITT | IA |
| 2018-08-10 | 563-221-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | DE WITT | IA |
| 2016-09-01 | 563-221-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DE WITT | IA |
| 2010-03-05 | 563-221-8XXX | 8000–8999 | Assigned | MCC TELEPHONY OF IOWA, LLC - IA | 751F | DE WITT | IA |
| 2024-07-17 | 563-221-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | DE WITT | 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.