NumberResearchThousands-blocks in 515-532
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 515-532 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 515 blocks
Most active assignees, all time — NPA 515
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-03-03 | 515-532-0XXX | 0000–0999 | Assigned | MCC TELEPHONY OF IOWA, LLC - IA | 751F | CLARION | IA |
| — | 515-532-1XXX | 1000–1999 | Reserved | QWEST CORPORATION | 9631 | CLARION | IA |
| — | 515-532-2XXX | 2000–2999 | Reserved | QWEST CORPORATION | 9631 | CLARION | IA |
| — | 515-532-3XXX | 3000–3999 | Reserved | QWEST CORPORATION | 9631 | CLARION | IA |
| 2017-03-24 | 515-532-4XXX | 4000–4999 | Assigned | AUREON COMMUNICATIONS, LLC | 444G | CLARION | IA |
| 2010-03-08 | 515-532-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | CLARION | IA |
| — | 515-532-6XXX | 6000–6999 | Reserved | QWEST CORPORATION | 9631 | CLARION | IA |
| 2011-12-28 | 515-532-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - IA | 985E | CLARION | IA |
| 2006-07-26 | 515-532-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CLARION | IA |
| — | 515-532-9XXX | 9000–9999 | Reserved | QWEST CORPORATION | 9631 | CLARION | IA |
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.