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 |
|---|---|---|---|---|---|---|---|
| 2020-02-24 | 628-271-1XXX | 1000–1999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SNFC CNTRL | CA |
| 2019-06-04 | 628-336-6XXX | 6000–6999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SAN RAFAEL | CA |
| 2018-11-01 | 628-259-3XXX | 3000–3999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | IGNACIO | CA |
| 2018-08-24 | 628-867-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SNFC CNTRL | CA |
| 2018-06-20 | 628-280-3XXX | 3000–3999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SNFC MT-EV | CA |
| 2017-12-15 | 628-259-2XXX | 2000–2999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | IGNACIO | CA |
| 2017-12-05 | 628-240-3XXX | 3000–3999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SAN RAFAEL | CA |
| 2016-08-17 | 628-253-5XXX | 5000–5999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SAN RAFAEL | CA |
| 2016-01-15 | 628-201-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | 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.