NumberResearchThousands-blocks in 231-880
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 231-880 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, all time — 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 |
|---|---|---|---|---|---|---|---|
| 2021-09-08 | 231-880-0XXX | 0000–0999 | Assigned | SKYE TELECOM LLC DBA SKYETEL | 622J | MUSKEGON | MI |
| 2021-09-09 | 231-880-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | MUSKEGON | MI |
| 2021-09-20 | 231-880-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | MUSKEGON | MI |
| 2023-07-13 | 231-880-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | MUSKEGON | MI |
| 2023-07-13 | 231-880-4XXX | 4000–4999 | Assigned | ONVOY, LLCV - MI | 543C | MUSKEGON | MI |
| 2023-05-23 | 231-880-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MUSKEGON | MI |
| 2023-05-23 | 231-880-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MUSKEGON | MI |
| 2021-12-30 | 231-880-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MUSKEGON | MI |
| 2021-09-09 | 231-880-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | MUSKEGON | MI |
| 2021-09-09 | 231-880-9XXX | 9000–9999 | Assigned | COMMIO, LLC | 939H | MUSKEGON | 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.