NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/25/2026
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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-06-14 | 731-233-4XXX | 4000–4999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | GREENFIELD | TN |
| 2022-06-14 | 731-600-2XXX | 2000–2999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | MCKENZIE | TN |
| 2022-01-04 | 731-274-6XXX | 6000–6999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | SIDONIA | TN |
| 2022-01-04 | 731-275-4XXX | 4000–4999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | PALMERSVL | TN |
| 2020-05-28 | 731-703-2XXX | 2000–2999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | SHARON | TN |
| 2019-09-27 | 731-241-1XXX | 1000–1999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | PARIS | TN |
| 2019-09-27 | 731-888-2XXX | 2000–2999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | BIG SANDY | TN |
| 2018-08-20 | 731-281-8XXX | 8000–8999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | MARTIN | TN |
| 2018-08-20 | 731-341-4XXX | 4000–4999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | DRESDEN | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.