NumberResearchThousands-blocks in 563-657
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 563-657 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-07-22 | 563-657-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WALCOTT | IA |
| 2017-02-14 | 563-657-1XXX | 1000–1999 | Assigned | CS TECHNOLOGIES, INC. - IA | 204A | WALCOTT | IA |
| 2021-02-15 | 563-657-2XXX | 2000–2999 | Assigned | ONVOY, LLC - IA | 221F | WALCOTT | IA |
| 2015-02-12 | 563-657-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WALCOTT | IA |
| — | 563-657-4XXX | 4000–4999 | Available | WALCOTT | IA | ||
| 2021-02-15 | 563-657-5XXX | 5000–5999 | Assigned | ONVOY, LLC - IA | 221F | WALCOTT | IA |
| 2016-09-07 | 563-657-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WALCOTT | IA |
| 2013-11-13 | 563-657-7XXX | 7000–7999 | Assigned | ONVOY, LLC - IA | 221F | WALCOTT | IA |
| 2013-11-13 | 563-657-8XXX | 8000–8999 | Assigned | ONVOY, LLC - IA | 221F | WALCOTT | IA |
| — | 563-657-9XXX | 9000–9999 | Available | WALCOTT | 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.