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 628
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-02-18 | 628-228-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2016-02-18 | 628-228-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-0XXX | 0000–0999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-7XXX | 7000–7999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-8XXX | 8000–8999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-06-02 | 628-206-9XXX | 9000–9999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-04-10 | 628-242-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | CA |
| 2015-04-10 | 628-242-7XXX | 7000–7999 | Assigned | PACIFIC BELL | 9740 | SNFC CNTRL | 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.