NumberResearchThousands-blocks in 903-374
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 903-374 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 |
|---|---|---|---|---|---|---|---|
| — | 903-374-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | GLADEWATER | TX |
| 2005-06-02 | 903-374-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 6506 | GLADEWATER | TX |
| 2007-04-25 | 903-374-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | GLADEWATER | TX |
| 2010-08-05 | 903-374-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | GLADEWATER | TX |
| 2003-05-22 | 903-374-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | GLADEWATER | TX |
| 2009-04-09 | 903-374-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 6506 | GLADEWATER | TX |
| 2010-09-22 | 903-374-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 6506 | GLADEWATER | TX |
| 2010-11-01 | 903-374-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GLADEWATER | TX |
| 2011-06-04 | 903-374-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | GLADEWATER | TX |
| — | 903-374-9XXX | 9000–9999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | GLADEWATER | 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.