NumberResearchThousands-blocks in 425-578
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 425-578 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 425 blocks
Most active assignees, all time — NPA 425
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-01-14 | 425-578-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | MAPLE VLY | WA |
| 2016-01-14 | 425-578-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | MAPLE VLY | WA |
| 2023-05-01 | 425-578-2XXX | 2000–2999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | MAPLE VLY | WA |
| — | 425-578-3XXX | 3000–3999 | Available | MAPLE VLY | WA | ||
| 2010-05-25 | 425-578-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MAPLE VLY | WA |
| 2018-05-11 | 425-578-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF WASHINGTON, LLC - WA | 159F | MAPLE VLY | WA |
| — | 425-578-6XXX | 6000–6999 | Available | MAPLE VLY | WA | ||
| 2015-09-15 | 425-578-7XXX | 7000–7999 | Assigned | ONVOY, LLC - WA | 483E | MAPLE VLY | WA |
| — | 425-578-8XXX | 8000–8999 | Available | MAPLE VLY | WA | ||
| — | 425-578-9XXX | 9000–9999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MAPLE VLY | WA |
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.