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 520
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-04-12 | 520-590-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BISBEE | AZ |
| 2021-09-03 | 520-563-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BENSON | AZ |
| 2021-09-03 | 520-564-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | DOUGLAS | AZ |
| 2021-09-03 | 520-567-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HAYDEN | AZ |
| 2021-09-03 | 520-569-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SAN MANUEL | AZ |
| 2021-09-03 | 520-581-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TOMBSTONE | AZ |
| 2021-09-03 | 520-583-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WHITLOW | AZ |
| 2021-09-02 | 520-394-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NOGALES | AZ |
| 2021-09-02 | 520-541-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WILLCOX | AZ |
| 2021-09-02 | 520-556-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SIERRAVIST | AZ |
| 2021-09-02 | 520-580-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SUPERIOR | AZ |
| 2021-03-05 | 520-537-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TUCSON | AZ |
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.