NumberResearchThousands-blocks in 641-436
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 641-436 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 641 blocks
Most active assignees, all time — NPA 641
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 641-436-0XXX | 0000–0999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | CENTERVL | IA |
| — | 641-436-1XXX | 1000–1999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | CENTERVL | IA |
| 2020-10-22 | 641-436-2XXX | 2000–2999 | Assigned | ONVOY, LLC - IA | 221F | CENTERVL | IA |
| 2020-10-22 | 641-436-3XXX | 3000–3999 | Assigned | ONVOY, LLC - IA | 221F | CENTERVL | IA |
| 2021-03-19 | 641-436-4XXX | 4000–4999 | Assigned | ONVOY, LLC - IA | 221F | CENTERVL | IA |
| 2021-03-19 | 641-436-5XXX | 5000–5999 | Assigned | ONVOY, LLC - IA | 221F | CENTERVL | IA |
| — | 641-436-6XXX | 6000–6999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | CENTERVL | IA |
| — | 641-436-7XXX | 7000–7999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | CENTERVL | IA |
| 2020-07-15 | 641-436-8XXX | 8000–8999 | Assigned | ONVOY, LLC - IA | 221F | CENTERVL | IA |
| 2023-02-01 | 641-436-9XXX | 9000–9999 | Assigned | ONVOY, LLC - IA | 221F | CENTERVL | 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.