NumberResearchThousands-blocks in 423-216
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 423-216 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 423-216-0XXX | 0000–0999 | Reserved | PAETEC ITEL, LLC | 829J | BENTON | TN |
| 2019-10-25 | 423-216-1XXX | 1000–1999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | BENTON | TN |
| 2020-02-25 | 423-216-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2020-02-25 | 423-216-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2020-05-19 | 423-216-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2020-05-19 | 423-216-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2021-06-11 | 423-216-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2021-06-11 | 423-216-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2022-10-25 | 423-216-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | BENTON | TN |
| 2020-12-24 | 423-216-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | 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.