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 435
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-03-17 | 435-547-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BRIAN HEAD | UT |
| 2022-03-17 | 435-600-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | PAROWAN | UT |
| 2022-03-16 | 435-250-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | NEPHI | UT |
| 2022-03-16 | 435-261-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BEAVER | UT |
| 2022-03-16 | 435-271-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SALINA | UT |
| 2022-03-16 | 435-301-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ST GEORGE | UT |
| 2022-03-16 | 435-317-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LOGAN | UT |
| 2022-03-16 | 435-341-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MONROE | UT |
| 2022-03-16 | 435-352-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HEBER CITY | UT |
| 2022-03-16 | 435-567-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | RICHFIELD | UT |
| 2022-03-16 | 435-667-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | BRIGHAM CY | UT |
| 2022-03-16 | 435-699-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | PARK CITY | UT |
| 2022-03-16 | 435-737-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TOOELE | UT |
| 2022-03-16 | 435-868-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | CEDAR CITY | UT |
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.