NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 480
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-04-12 | 480-500-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2013-03-28 | 480-378-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2013-03-28 | 480-378-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2011-02-07 | 480-646-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2010-01-12 | 480-253-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2009-09-14 | 480-327-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2009-08-10 | 480-339-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2008-05-22 | 480-455-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2008-05-22 | 480-455-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2008-05-22 | 480-455-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2007-11-16 | 480-295-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2007-11-16 | 480-295-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2007-07-23 | 480-289-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2007-07-23 | 480-289-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2007-02-22 | 480-374-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2007-02-07 | 480-374-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
| 2006-01-06 | 480-588-1XXX | 1000–1999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | PHOENIX | AZ |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.