NumberResearchThousands-blocks in 501-567
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 501-567 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 501 blocks
Most active assignees, all time — NPA 501
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-06-29 | 501-567-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AR | 196F | CENTER RDG | AR |
| 2024-02-12 | 501-567-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CENTER RDG | AR |
| 2021-02-10 | 501-567-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AR | 348F | CENTER RDG | AR |
| 2021-02-10 | 501-567-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AR | 348F | CENTER RDG | AR |
| 2024-03-22 | 501-567-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CENTER RDG | AR |
| 2026-06-01 | 501-567-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | CENTER RDG | AR |
| 2022-08-17 | 501-567-6XXX | 6000–6999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | CENTER RDG | AR |
| 2026-06-01 | 501-567-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | CENTER RDG | AR |
| 2020-11-20 | 501-567-8XXX | 8000–8999 | Assigned | FRACTEL, LLC | 965H | CENTER RDG | AR |
| — | 501-567-9XXX | 9000–9999 | Available | CENTER RDG | AR |
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.