NumberResearchThousands-blocks in 425-657
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 425-657 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-12-30 | 425-657-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | ISSAQUAH | WA |
| — | 425-657-1XXX | 1000–1999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - WA | 7146 | ISSAQUAH | WA |
| — | 425-657-2XXX | 2000–2999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - WA | 7146 | ISSAQUAH | WA |
| 2016-02-10 | 425-657-3XXX | 3000–3999 | Assigned | ONVOY, LLC - WA | 483E | ISSAQUAH | WA |
| — | 425-657-4XXX | 4000–4999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - WA | 7146 | ISSAQUAH | WA |
| 2016-02-10 | 425-657-5XXX | 5000–5999 | Assigned | ONVOY, LLC - WA | 483E | ISSAQUAH | WA |
| 2016-03-08 | 425-657-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | ISSAQUAH | WA |
| — | 425-657-7XXX | 7000–7999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - WA | 7146 | ISSAQUAH | WA |
| 2016-06-14 | 425-657-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ISSAQUAH | WA |
| 2018-10-18 | 425-657-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA | 5812 | ISSAQUAH | 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.