NumberResearchThousands-blocks in 231-296
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 231-296 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 231 blocks
Most active assignees, last 30 days — NPA 231
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-05-13 | 231-296-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | FREMONT | MI |
| 2021-12-07 | 231-296-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | FREMONT | MI |
| 2021-05-20 | 231-296-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | FREMONT | MI |
| — | 231-296-3XXX | 3000–3999 | Available | FREMONT | MI | ||
| 2022-10-27 | 231-296-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | FREMONT | MI |
| 2024-10-22 | 231-296-5XXX | 5000–5999 | Assigned | NUSO, LLC | 732J | FREMONT | MI |
| 2021-06-11 | 231-296-6XXX | 6000–6999 | Assigned | ONVOY, LLCV - MI | 543C | FREMONT | MI |
| 2021-06-11 | 231-296-7XXX | 7000–7999 | Assigned | ONVOY, LLCV - MI | 543C | FREMONT | MI |
| — | 231-296-8XXX | 8000–8999 | Available | FREMONT | MI | ||
| 2026-09-14 | 231-296-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FREMONT | 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.