NumberResearchThousands-blocks in 903-660
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 903-660 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 |
|---|---|---|---|---|---|---|---|
| — | 903-660-0XXX | 0000–0999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | HALLSVILLE | TX |
| 2021-02-23 | 903-660-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | HALLSVILLE | TX |
| — | 903-660-2XXX | 2000–2999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | HALLSVILLE | TX |
| — | 903-660-3XXX | 3000–3999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | HALLSVILLE | TX |
| 2024-10-31 | 903-660-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | HALLSVILLE | TX |
| 2011-06-10 | 903-660-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | HALLSVILLE | TX |
| 2021-10-26 | 903-660-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TX | 903C | HALLSVILLE | TX |
| 2014-08-14 | 903-660-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | HALLSVILLE | TX |
| 2019-02-12 | 903-660-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | HALLSVILLE | TX |
| 2024-07-31 | 903-660-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TX | 903C | HALLSVILLE | 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.