NumberResearchThousands-blocks in 580-857
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 580-857 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 580 blocks
Most active assignees, all time — NPA 580
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-04-21 | 580-857-0XXX | 0000–0999 | Assigned | ONVOY, LLC - OK | 409F | ALLEN | OK |
| — | 580-857-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | ALLEN | OK |
| — | 580-857-2XXX | 2000–2999 | Reserved | SOUTHWESTERN BELL | 9533 | ALLEN | OK |
| 2021-10-28 | 580-857-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | ALLEN | OK |
| 2005-09-27 | 580-857-4XXX | 4000–4999 | Assigned | CHICKASAW TELECOMMUNICAIONS SERVICES, INC. | 4630 | ALLEN | OK |
| 2011-08-15 | 580-857-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ALLEN | OK |
| 2021-10-28 | 580-857-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | ALLEN | OK |
| 2015-12-31 | 580-857-7XXX | 7000–7999 | Assigned | ONVOY, LLC - OK | 409F | ALLEN | OK |
| 2026-03-06 | 580-857-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ALLEN | OK |
| — | 580-857-9XXX | 9000–9999 | Available | ALLEN | OK |
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.