NumberResearchThousands-blocks in 580-535
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 580-535 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
Jul 2026
Jun 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-01-26 | 580-535-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | GRANITE | OK |
| — | 580-535-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | GRANITE | OK |
| 2019-09-04 | 580-535-2XXX | 2000–2999 | Assigned | TELNYX LLC | 073H | GRANITE | OK |
| — | 580-535-3XXX | 3000–3999 | Available | GRANITE | OK | ||
| — | 580-535-4XXX | 4000–4999 | Reserved | SOUTHWESTERN BELL | 9533 | GRANITE | OK |
| 2021-02-03 | 580-535-5XXX | 5000–5999 | Assigned | ONVOY, LLC - OK | 409F | GRANITE | OK |
| 2025-06-16 | 580-535-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GRANITE | OK |
| 2011-01-06 | 580-535-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GRANITE | OK |
| 2016-05-31 | 580-535-8XXX | 8000–8999 | Assigned | ONVOY, LLC - OK | 409F | GRANITE | OK |
| 2016-05-31 | 580-535-9XXX | 9000–9999 | Assigned | ONVOY, LLC - OK | 409F | GRANITE | 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.