NumberResearchThousands-blocks in 731-600
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 731-600 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2019-10-02 | 731-600-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | MCKENZIE | TN |
| 2019-11-08 | 731-600-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | MCKENZIE | TN |
| 2022-06-14 | 731-600-2XXX | 2000–2999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | MCKENZIE | TN |
| 2023-05-10 | 731-600-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MCKENZIE | TN |
| 2023-11-27 | 731-600-4XXX | 4000–4999 | Assigned | PEERLESS NETWORK OF TENNESSEE, LLC - TN | 276F | MCKENZIE | TN |
| 2024-01-08 | 731-600-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MCKENZIE | TN |
| 2019-10-02 | 731-600-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | MCKENZIE | TN |
| — | 731-600-7XXX | 7000–7999 | Available | MCKENZIE | TN | ||
| 2022-03-02 | 731-600-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | MCKENZIE | TN |
| 2021-12-14 | 731-600-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MCKENZIE | 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.