NumberResearchThousands-blocks in 731-540
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 731-540 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-02-14 | 731-540-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | PARIS | TN |
| 2005-12-07 | 731-540-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | PARIS | TN |
| 2017-02-03 | 731-540-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | PARIS | TN |
| 2010-10-20 | 731-540-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PARIS | TN |
| — | 731-540-4XXX | 4000–4999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | PARIS | TN |
| 2017-02-03 | 731-540-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | PARIS | TN |
| 2021-02-11 | 731-540-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | PARIS | TN |
| 2016-02-17 | 731-540-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | PARIS | TN |
| 2016-02-17 | 731-540-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | PARIS | TN |
| 2010-05-21 | 731-540-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | PARIS | 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.