NumberResearchThousands-blocks in 903-636
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 903-636 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
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-04-02 | 903-636-0XXX | 0000–0999 | Assigned | ETEX COMMUNCATIONS, LLC DBA ETEX TELECOM - TX | 3196 | BIG SANDY | TX |
| 2021-02-11 | 903-636-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | BIG SANDY | TX |
| 2024-04-25 | 903-636-2XXX | 2000–2999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | BIG SANDY | TX |
| 2011-11-14 | 903-636-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | BIG SANDY | TX |
| — | 903-636-4XXX | 4000–4999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | BIG SANDY | TX |
| — | 903-636-5XXX | 5000–5999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | BIG SANDY | TX |
| 2018-07-30 | 903-636-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TX | 903C | BIG SANDY | TX |
| 2020-07-29 | 903-636-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TX | 903C | BIG SANDY | TX |
| 2020-07-29 | 903-636-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TX | 903C | BIG SANDY | TX |
| — | 903-636-9XXX | 9000–9999 | Reserved | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | BIG SANDY | 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.