NumberResearchThousands-blocks in 425-440
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 425-440 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
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-05-02 | 425-440-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | BELLEVUE | WA |
| 2010-07-09 | 425-440-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BELLEVUE | WA |
| 2008-05-01 | 425-440-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | BELLEVUE | WA |
| 2008-05-21 | 425-440-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | BELLEVUE | WA |
| 2008-02-13 | 425-440-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9638 | BELLEVUE | WA |
| 2020-06-24 | 425-440-5XXX | 5000–5999 | Assigned | ELTOPIA COMMUNICATIONS, LLC - WA | 663D | BELLEVUE | WA |
| 2009-03-05 | 425-440-6XXX | 6000–6999 | Assigned | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7173 | BELLEVUE | WA |
| 2009-05-07 | 425-440-7XXX | 7000–7999 | Assigned | ONVOY, LLC - WA | 483E | BELLEVUE | WA |
| 2008-05-21 | 425-440-8XXX | 8000–8999 | Assigned | ONVOY, LLC - WA | 483E | BELLEVUE | WA |
| 2008-05-21 | 425-440-9XXX | 9000–9999 | Assigned | ONVOY, LLC - WA | 483E | BELLEVUE | 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.