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 458
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-08-06 | 458-318-2XXX | 2000–2999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | HERMISTON | OR |
| 2022-05-02 | 458-877-2XXX | 2000–2999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | LA GRANDE | OR |
| 2021-11-02 | 458-271-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | ROSEBURG | OR |
| 2021-08-27 | 458-229-5XXX | 5000–5999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | GRANTSPASS | OR |
| 2020-11-25 | 458-257-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | GRANTSPASS | OR |
| 2020-10-21 | 458-592-3XXX | 3000–3999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | CAVE JCT | OR |
| 2020-09-29 | 458-255-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | HERMISTON | OR |
| 2020-08-11 | 458-229-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | GRANTSPASS | OR |
| 2017-10-03 | 458-229-1XXX | 1000–1999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | GRANTSPASS | OR |
| 2017-08-29 | 458-226-1XXX | 1000–1999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | MEDFORD | OR |
| 2017-04-11 | 458-226-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | MEDFORD | OR |
| 2016-08-01 | 458-229-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | GRANTSPASS | OR |
| 2016-03-04 | 458-219-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - OR | 6349 | HERMISTON | OR |
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.