NumberResearchThousands-blocks in 731-623
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 731-623 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 |
|---|---|---|---|---|---|---|---|
| 2015-06-10 | 731-623-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF TENNESSEE, LLC - TN | 276F | TIPTONVL | TN |
| — | 731-623-1XXX | 1000–1999 | Reserved | PAETEC ITEL, LLC | 829J | TIPTONVL | TN |
| — | 731-623-2XXX | 2000–2999 | Reserved | PAETEC ITEL, LLC | 829J | TIPTONVL | TN |
| — | 731-623-3XXX | 3000–3999 | Reserved | PAETEC ITEL, LLC | 829J | TIPTONVL | TN |
| 2005-12-06 | 731-623-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | TIPTONVL | TN |
| 2011-08-17 | 731-623-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | TIPTONVL | TN |
| 2021-02-16 | 731-623-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | TIPTONVL | TN |
| 2012-03-09 | 731-623-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | TIPTONVL | TN |
| 2020-04-13 | 731-623-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | TIPTONVL | TN |
| 2014-04-07 | 731-623-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | TIPTONVL | 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.