NumberResearchThousands-blocks in 903-524
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 903-524 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 903 blocks
Most active assignees, all time — NPA 903
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-10-28 | 903-524-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TX | 903C | WINFIELD | TX |
| — | 903-524-1XXX | 1000–1999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | WINFIELD | TX |
| — | 903-524-2XXX | 2000–2999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | WINFIELD | TX |
| 2021-03-16 | 903-524-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | WINFIELD | TX |
| 2023-01-13 | 903-524-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | WINFIELD | TX |
| 2018-07-30 | 903-524-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TX | 903C | WINFIELD | TX |
| 2021-06-02 | 903-524-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WINFIELD | TX |
| 2013-10-28 | 903-524-7XXX | 7000–7999 | Assigned | PEOPLES COMMUNICATION, INC. -TX | 135H | WINFIELD | TX |
| 2021-11-10 | 903-524-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WINFIELD | TX |
| 2021-11-10 | 903-524-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WINFIELD | TX |
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.