NumberResearchThousands-blocks in 731-800
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 731-800 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 731 blocks
Most active assignees, all time — NPA 731
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-09-28 | 731-800-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | LEXINGTON | TN |
| 2022-10-07 | 731-800-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | LEXINGTON | TN |
| — | 731-800-2XXX | 2000–2999 | Available | LEXINGTON | TN | ||
| — | 731-800-3XXX | 3000–3999 | Available | LEXINGTON | TN | ||
| 2024-02-12 | 731-800-4XXX | 4000–4999 | Assigned | PEERLESS NETWORK OF TENNESSEE, LLC - TN | 276F | LEXINGTON | TN |
| 2024-01-11 | 731-800-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | LEXINGTON | TN |
| 2021-03-11 | 731-800-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | LEXINGTON | TN |
| 2021-03-11 | 731-800-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | LEXINGTON | TN |
| 2017-09-28 | 731-800-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | LEXINGTON | TN |
| 2022-01-04 | 731-800-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LEXINGTON | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.