NumberResearchThousands-blocks in 570-521
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 570-521 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 |
|---|---|---|---|---|---|---|---|
| — | 570-521-0XXX | 0000–0999 | Available | JERMYN | PA | ||
| 2020-04-06 | 570-521-1XXX | 1000–1999 | Assigned | ONVOY, LLC - PA | 547E | JERMYN | PA |
| 2017-05-03 | 570-521-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - PA | 002F | JERMYN | PA |
| 2020-04-06 | 570-521-3XXX | 3000–3999 | Assigned | ONVOY, LLC - PA | 547E | JERMYN | PA |
| 2009-02-23 | 570-521-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | JERMYN | PA |
| — | 570-521-5XXX | 5000–5999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JERMYN | PA |
| — | 570-521-6XXX | 6000–6999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JERMYN | PA |
| 2015-12-29 | 570-521-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | JERMYN | PA |
| 2017-12-19 | 570-521-8XXX | 8000–8999 | Assigned | LIMITLESS MOBILE, LLC | 6921 | JERMYN | PA |
| 2020-04-06 | 570-521-9XXX | 9000–9999 | Assigned | ONVOY, LLC - PA | 547E | JERMYN | 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.