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 972
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-11-20 | 972-366-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | VENUS | TX |
| 2017-11-20 | 972-430-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BLUE RIDGE | TX |
| 2017-11-20 | 972-433-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PROSPER | TX |
| 2017-11-20 | 972-734-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | PRINCETON | TX |
| 2017-11-20 | 972-833-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | FERRIS | TX |
| 2017-11-20 | 972-846-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BRISTOL | TX |
| 2017-06-20 | 972-408-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | GRANDPRARI | TX |
| 2016-03-02 | 972-737-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ALLEN | TX |
| 2015-12-08 | 972-236-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | CARROLLTON | TX |
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.