NumberResearchThousands-blocks in 903-319
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 903-319 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-06-16 | 903-319-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | HOOKS | TX |
| — | 903-319-1XXX | 1000–1999 | Reserved | T-MOBILE USA, INC. | 6529 | HOOKS | TX |
| 2021-11-10 | 903-319-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | HOOKS | TX |
| 2026-06-11 | 903-319-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | HOOKS | TX |
| — | 903-319-4XXX | 4000–4999 | Reserved | T-MOBILE USA, INC. | 6529 | HOOKS | TX |
| — | 903-319-5XXX | 5000–5999 | Available | HOOKS | TX | ||
| — | 903-319-6XXX | 6000–6999 | Available | HOOKS | TX | ||
| 2024-02-21 | 903-319-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | HOOKS | TX |
| — | 903-319-8XXX | 8000–8999 | Available | HOOKS | TX | ||
| — | 903-319-9XXX | 9000–9999 | Reserved | T-MOBILE USA, INC. | 6529 | HOOKS | 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.