NumberResearchThousands-blocks in 903-354
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 903-354 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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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-10-19 | 903-354-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | EMHOUSE | TX |
| — | 903-354-1XXX | 1000–1999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | EMHOUSE | TX |
| 2013-01-07 | 903-354-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TX | 903C | EMHOUSE | TX |
| 2012-06-07 | 903-354-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TX | 903C | EMHOUSE | TX |
| 2011-03-15 | 903-354-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | EMHOUSE | TX |
| 2009-01-23 | 903-354-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | EMHOUSE | TX |
| — | 903-354-6XXX | 6000–6999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | EMHOUSE | TX |
| 2009-02-05 | 903-354-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TX | 903C | EMHOUSE | TX |
| 2011-10-28 | 903-354-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TX | 903C | EMHOUSE | TX |
| 2013-09-24 | 903-354-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF TEXAS, LLC - TX | 177F | EMHOUSE | 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.