NumberResearchThousands-blocks in 715-531
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 715-531 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 715 blocks
Most active assignees, all time — NPA 715
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 715-531-0XXX | 0000–0999 | Reserved | WISCONSIN BELL INC | 9327 | HUDSON | WI |
| — | 715-531-1XXX | 1000–1999 | Reserved | WISCONSIN BELL INC | 9327 | HUDSON | WI |
| 2018-09-19 | 715-531-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | HUDSON | WI |
| 2011-08-30 | 715-531-3XXX | 3000–3999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HUDSON | WI |
| 2012-01-04 | 715-531-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HUDSON | WI |
| 2009-02-25 | 715-531-5XXX | 5000–5999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | HUDSON | WI |
| — | 715-531-6XXX | 6000–6999 | Reserved | WISCONSIN BELL INC | 9327 | HUDSON | WI |
| 2011-06-09 | 715-531-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HUDSON | WI |
| 2011-01-19 | 715-531-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | HUDSON | WI |
| 2014-07-07 | 715-531-9XXX | 9000–9999 | Assigned | SOMERSET TEL. CO., INC. | 0951 | HUDSON | WI |
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.