NumberResearchThousands-blocks in 580-721
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 580-721 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 580-721-0XXX | 0000–0999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK | 5813 | MARLOW | OK |
| 2015-01-05 | 580-721-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK | 5813 | MARLOW | OK |
| 2024-11-14 | 580-721-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK | 5813 | MARLOW | OK |
| 2021-02-03 | 580-721-3XXX | 3000–3999 | Assigned | ONVOY, LLC - OK | 409F | MARLOW | OK |
| 2021-02-03 | 580-721-4XXX | 4000–4999 | Assigned | ONVOY, LLC - OK | 409F | MARLOW | OK |
| 2010-11-08 | 580-721-5XXX | 5000–5999 | Assigned | CHICKASAW TELECOMMUNICAIONS SERVICES, INC. | 4630 | MARLOW | OK |
| 2013-01-17 | 580-721-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA OK - LLC | 530C | MARLOW | OK |
| 2015-03-06 | 580-721-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MARLOW | OK |
| 2025-03-27 | 580-721-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | MARLOW | OK |
| — | 580-721-9XXX | 9000–9999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK | 5813 | MARLOW | 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.