NumberResearchThousands-blocks in 423-299
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 423-299 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 423 blocks
Most active assignees, all time — NPA 423
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-10-20 | 423-299-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BENTON | TN |
| 2017-02-27 | 423-299-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2009-07-13 | 423-299-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2010-02-02 | 423-299-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2017-04-12 | 423-299-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2008-10-29 | 423-299-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2017-02-27 | 423-299-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2026-07-09 | 423-299-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BENTON | TN |
| — | 423-299-8XXX | 8000–8999 | Available | BENTON | TN | ||
| 2007-03-12 | 423-299-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | BENTON | 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.