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 603
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 |
|---|---|---|---|---|---|---|---|
| 2020-11-25 | 603-562-2XXX | 2000–2999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | PETERBROGH | NH |
| 2020-04-01 | 603-504-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | CLAREMONT | NH |
| 2017-12-19 | 603-901-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | CONWAY | NH |
| 2016-12-06 | 603-409-8XXX | 8000–8999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | LACONIA | NH |
| 2016-08-02 | 603-562-1XXX | 1000–1999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | PETERBROGH | NH |
| 2016-05-03 | 603-680-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | HILLSBORO | NH |
| 2014-01-23 | 603-562-4XXX | 4000–4999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | PETERBROGH | NH |
| 2009-01-06 | 603-562-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | PETERBROGH | NH |
| 2007-10-05 | 603-342-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | BERLIN | NH |
| 2007-03-02 | 603-326-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | BERLIN | NH |
| 2005-09-12 | 603-690-5XXX | 5000–5999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | CLAREMONT | NH |
| 2004-07-15 | 603-464-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | HILLSBORO | NH |
| 2003-12-05 | 603-499-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | KEENE | NH |
| 2003-12-05 | 603-499-1XXX | 1000–1999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | KEENE | NH |
| 2003-12-05 | 603-499-2XXX | 2000–2999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | KEENE | NH |
| 2003-12-05 | 603-499-3XXX | 3000–3999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | KEENE | NH |
| 2003-12-05 | 603-499-5XXX | 5000–5999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | KEENE | NH |
| 2003-12-05 | 603-499-6XXX | 6000–6999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | KEENE | NH |
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.