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 559
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-10-31 | 559-387-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | CLOVIS | CA |
| 2013-10-31 | 559-387-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | CLOVIS | CA |
| 2013-10-31 | 559-387-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | CLOVIS | CA |
| 2011-05-26 | 559-852-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | HANFORD | CA |
| 2011-05-26 | 559-852-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | HANFORD | CA |
| 2009-11-03 | 559-600-0XXX | 0000–0999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-7XXX | 7000–7999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-8XXX | 8000–8999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2009-11-03 | 559-600-9XXX | 9000–9999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2006-03-07 | 559-388-0XXX | 0000–0999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
| 2005-09-28 | 559-934-8XXX | 8000–8999 | Assigned | PACIFIC BELL | 9740 | COALINGA | CA |
| 2003-12-02 | 559-477-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | FRESNO | CA |
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.