NumberResearchThousands-blocks in 515-531
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 515-531 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 515 blocks
Most active assignees, all time — NPA 515
New assignments by month
Sep 2026
Aug 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-05-08 | 515-531-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - IA | 985E | GRANGER | IA |
| 2018-05-02 | 515-531-1XXX | 1000–1999 | Assigned | INTEGRATED PATH COMMUNCATIONS, LLC - IA | 544H | GRANGER | IA |
| 2018-07-02 | 515-531-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IA | 985E | GRANGER | IA |
| 2020-05-04 | 515-531-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | GRANGER | IA |
| 2020-10-21 | 515-531-4XXX | 4000–4999 | Assigned | ONVOY, LLC - IA | 221F | GRANGER | IA |
| 2019-08-23 | 515-531-5XXX | 5000–5999 | Assigned | ONVOY, LLC - IA | 221F | GRANGER | IA |
| 2024-09-27 | 515-531-6XXX | 6000–6999 | Assigned | AUREON COMMUNICATIONS, LLC | 444G | GRANGER | IA |
| 2017-03-29 | 515-531-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GRANGER | IA |
| 2022-01-26 | 515-531-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - IA | 985E | GRANGER | IA |
| 2018-08-10 | 515-531-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GRANGER | IA |
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.