NumberResearchThousands-blocks in 731-281
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 731-281 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 |
|---|---|---|---|---|---|---|---|
| 2026-04-27 | 731-281-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | MARTIN | TN |
| — | 731-281-1XXX | 1000–1999 | Reserved | PAETEC ITEL, LLC | 829J | MARTIN | TN |
| — | 731-281-2XXX | 2000–2999 | Reserved | PAETEC ITEL, LLC | 829J | MARTIN | TN |
| — | 731-281-3XXX | 3000–3999 | Reserved | PAETEC ITEL, LLC | 829J | MARTIN | TN |
| 2006-08-11 | 731-281-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MARTIN | TN |
| 2023-02-08 | 731-281-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MARTIN | TN |
| 2011-08-24 | 731-281-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MARTIN | TN |
| 2012-08-24 | 731-281-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MARTIN | TN |
| 2018-08-20 | 731-281-8XXX | 8000–8999 | Assigned | WEST KENTUCKY & TENNESSEE TELECOMMUNICATIONS CO-OP | 337J | MARTIN | TN |
| 2018-12-13 | 731-281-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MARTIN | 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.