NumberResearchThousands-blocks in 570-583
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 570-583 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 570 blocks
Most active assignees, all time — NPA 570
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-12-20 | 570-583-0XXX | 0000–0999 | Assigned | LIMITLESS MOBILE, LLC | 6921 | PORTLAND | PA |
| — | 570-583-1XXX | 1000–1999 | Available | PORTLAND | PA | ||
| 2017-05-18 | 570-583-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PORTLAND | PA |
| 2010-01-25 | 570-583-3XXX | 3000–3999 | Assigned | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | PORTLAND | PA |
| — | 570-583-4XXX | 4000–4999 | Available | PORTLAND | PA | ||
| 2025-07-07 | 570-583-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | PORTLAND | PA |
| 2016-02-22 | 570-583-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PORTLAND | PA |
| — | 570-583-7XXX | 7000–7999 | Assigned (pending) | PORTLAND | PA | ||
| 2019-10-11 | 570-583-8XXX | 8000–8999 | Assigned | ONVOY, LLC - PA | 547E | PORTLAND | PA |
| 2020-09-28 | 570-583-9XXX | 9000–9999 | Assigned | ONVOY, LLC - PA | 547E | PORTLAND | PA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.