NumberResearchThousands-blocks in 570-481
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 570-481 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-03-12 | 570-481-0XXX | 0000–0999 | Assigned | CORE COMMUNICATIONS, INC. - PA | 3806 | CRESCO | PA |
| 2012-06-08 | 570-481-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - PA | 002F | CRESCO | PA |
| 2023-12-06 | 570-481-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CRESCO | PA |
| 2006-09-08 | 570-481-3XXX | 3000–3999 | Assigned | CTSI, INC. - PA | 7513 | CRESCO | PA |
| 2005-06-24 | 570-481-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CRESCO | PA |
| 2016-08-22 | 570-481-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | CRESCO | PA |
| 2022-06-06 | 570-481-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CRESCO | PA |
| 2015-12-28 | 570-481-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CRESCO | PA |
| 2016-08-31 | 570-481-8XXX | 8000–8999 | Assigned | ONVOY, LLC - PA | 547E | CRESCO | PA |
| 2018-11-02 | 570-481-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | CRESCO | PA |
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.