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 731
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-01-04 | 731-238-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | MILAN | TN |
| 2022-01-04 | 731-244-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SELMER | TN |
| 2022-01-04 | 731-246-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | UNION CITY | TN |
| 2022-01-04 | 731-331-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BOLIVAR | TN |
| 2022-01-04 | 731-432-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BROWNSVL | TN |
| 2022-01-04 | 731-458-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SAVANNAH | TN |
| 2022-01-04 | 731-460-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | RIPLEY | TN |
| 2022-01-04 | 731-666-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CAMDEN | TN |
| 2022-01-04 | 731-730-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HENDERSON | TN |
| 2022-01-04 | 731-747-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | HUMBOLDT | TN |
| 2022-01-04 | 731-800-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LEXINGTON | TN |
| 2021-12-23 | 731-868-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | JACKSON | TN |
| 2021-12-23 | 731-931-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | DYERSBURG | TN |
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.