NumberResearchThousands-blocks in 517-239
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 517-239 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 517 blocks
Most active assignees, all time — NPA 517
New assignments by month
Sep 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-10-23 | 517-239-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DE WITT | MI |
| 2024-12-26 | 517-239-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MI | 991E | DE WITT | MI |
| — | 517-239-2XXX | 2000–2999 | Available | DE WITT | MI | ||
| 2021-05-18 | 517-239-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DE WITT | MI |
| 2015-04-24 | 517-239-4XXX | 4000–4999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | DE WITT | MI |
| 2021-11-05 | 517-239-5XXX | 5000–5999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DE WITT | MI |
| 2021-11-05 | 517-239-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DE WITT | MI |
| — | 517-239-7XXX | 7000–7999 | Assigned (pending) | DE WITT | MI | ||
| 2023-02-13 | 517-239-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | DE WITT | MI |
| — | 517-239-9XXX | 9000–9999 | Available | DE WITT | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.