NumberResearchThousands-blocks in 515-744
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 515-744 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 515-744-0XXX | 0000–0999 | Available | RADCLIFFE | IA | ||
| — | 515-744-1XXX | 1000–1999 | Available | RADCLIFFE | IA | ||
| — | 515-744-2XXX | 2000–2999 | Available | RADCLIFFE | IA | ||
| — | 515-744-3XXX | 3000–3999 | Available | RADCLIFFE | IA | ||
| 2018-05-02 | 515-744-4XXX | 4000–4999 | Assigned | INTEGRATED PATH COMMUNCATIONS, LLC - IA | 544H | RADCLIFFE | IA |
| 2026-05-19 | 515-744-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | RADCLIFFE | IA |
| — | 515-744-6XXX | 6000–6999 | Available | RADCLIFFE | IA | ||
| 2021-11-19 | 515-744-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | RADCLIFFE | IA |
| 2018-03-07 | 515-744-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | RADCLIFFE | IA |
| 2018-03-07 | 515-744-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | RADCLIFFE | 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.