NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 425
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-06-14 | 425-537-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | BOTHELL | WA |
| 2019-10-25 | 425-439-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | BOTHELL | WA |
| 2014-05-01 | 425-326-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | BELLEVUE | WA |
| 2013-02-19 | 425-435-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | BELLEVUE | WA |
| 2012-09-26 | 425-898-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | KIRKLAND | WA |
| 2012-07-17 | 425-492-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | BOTHELL | WA |
| 2012-04-02 | 425-628-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | BELLEVUE | WA |
| 2010-09-27 | 425-247-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | BELLEVUE | WA |
| 2007-09-27 | 425-495-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF WASHINGTON, LLC - WA | 7455 | 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.