NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 928
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-09-03 | 928-426-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | PRESCOTT | AZ |
| 2021-09-03 | 928-430-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SOMERTON | AZ |
| 2021-09-02 | 928-381-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | GRANDCNYON | AZ |
| 2021-09-02 | 928-406-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WINSLOW | AZ |
| 2021-09-02 | 928-413-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PIMA | AZ |
| 2021-09-02 | 928-417-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SAFFORD | AZ |
| 2021-09-02 | 928-423-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | FLAGSTAFF | AZ |
| 2021-09-02 | 928-471-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | PAYSON | AZ |
| 2021-09-02 | 928-592-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SEDONA | AZ |
| 2021-09-02 | 928-640-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PAGE | AZ |
| 2021-09-02 | 928-812-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | GLOBE | AZ |
| 2021-09-02 | 928-975-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | YUMA | AZ |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.