NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026
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
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-07-13 | 731-574-9XXX | 9000–9999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | JACKSON | TN |
| 2019-05-14 | 731-242-1XXX | 1000–1999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | HUNTINGDON | TN |
| 2018-08-30 | 731-207-5XXX | 5000–5999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | MCKENZIE | TN |
| 2018-08-30 | 731-229-1XXX | 1000–1999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | PARIS | TN |
| 2018-08-30 | 731-240-1XXX | 1000–1999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | JACKSON | TN |
| 2018-08-30 | 731-666-0XXX | 0000–0999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | CAMDEN | TN |
| 2016-12-21 | 731-265-6XXX | 6000–6999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | JACKSON | TN |
| 2016-11-14 | 731-507-0XXX | 0000–0999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | UNION CITY | TN |
| 2016-02-08 | 731-462-2XXX | 2000–2999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | MEDINA | TN |
| 2015-11-06 | 731-420-8XXX | 8000–8999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | HUMBOLDT | TN |
| 2014-09-16 | 731-300-7XXX | 7000–7999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | JACKSON | TN |
| 2013-05-03 | 731-238-3XXX | 3000–3999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | MILAN | TN |
| 2011-09-28 | 731-300-3XXX | 3000–3999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | JACKSON | TN |
| 2011-09-28 | 731-300-4XXX | 4000–4999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | JACKSON | TN |
| 2010-12-03 | 731-300-0XXX | 0000–0999 | Assigned | JACKSON ENERGY AUTHORITY - TN | 150G | JACKSON | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.