NumberResearchThousands-blocks in 531-727
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 531-727 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 531 blocks
Most active assignees, all time — NPA 531
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 |
|---|---|---|---|---|---|---|---|
| 2018-04-30 | 531-727-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - NE | 6263 | SEWARD | NE |
| 2018-07-31 | 531-727-1XXX | 1000–1999 | Assigned | UNITED STATES CELLULAR - NE | 6263 | SEWARD | NE |
| 2015-10-20 | 531-727-2XXX | 2000–2999 | Assigned | GREAT PLAINS BROADBAND, INC. - NE | 012E | SEWARD | NE |
| 2022-06-21 | 531-727-3XXX | 3000–3999 | Assigned | COMMIO, LLC | 939H | SEWARD | NE |
| 2021-06-25 | 531-727-4XXX | 4000–4999 | Assigned | UNITED STATES CELLULAR - NE | 6263 | SEWARD | NE |
| 2019-03-06 | 531-727-5XXX | 5000–5999 | Assigned | ONVOY, LLC - NE | 549E | SEWARD | NE |
| 2021-02-18 | 531-727-6XXX | 6000–6999 | Assigned | ONVOY, LLC - NE | 549E | SEWARD | NE |
| 2021-02-18 | 531-727-7XXX | 7000–7999 | Assigned | ONVOY, LLC - NE | 549E | SEWARD | NE |
| 2019-12-11 | 531-727-8XXX | 8000–8999 | Assigned | UNITED STATES CELLULAR - NE | 6263 | SEWARD | NE |
| 2020-04-16 | 531-727-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NE | 6263 | SEWARD | NE |
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.