NumberResearchThousands-blocks in 903-433
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 903-433 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 |
|---|---|---|---|---|---|---|---|
| — | 903-433-0XXX | 0000–0999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | GUNTER | TX |
| — | 903-433-1XXX | 1000–1999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | GUNTER | TX |
| — | 903-433-2XXX | 2000–2999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | GUNTER | TX |
| 2021-06-28 | 903-433-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TX | 903C | GUNTER | TX |
| 2022-12-19 | 903-433-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GUNTER | TX |
| — | 903-433-5XXX | 5000–5999 | Available | GUNTER | TX | ||
| 2021-08-26 | 903-433-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | GUNTER | TX |
| — | 903-433-7XXX | 7000–7999 | Available | GUNTER | TX | ||
| 2021-05-25 | 903-433-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF TEXAS, LLC - TX | 177F | GUNTER | TX |
| — | 903-433-9XXX | 9000–9999 | Available | GUNTER | 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.