NumberResearchThousands-blocks in 281-306
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 281-306 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 281 blocks
Most active assignees, all time — NPA 281
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-12-06 | 281-306-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SPLENDORA | TX |
| 2005-04-06 | 281-306-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SPLENDORA | TX |
| 2005-12-06 | 281-306-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SPLENDORA | TX |
| 2010-07-14 | 281-306-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | SPLENDORA | TX |
| 2002-06-26 | 281-306-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SPLENDORA | TX |
| 2017-06-06 | 281-306-5XXX | 5000–5999 | Assigned | TELNYX LLC | 073H | SPLENDORA | TX |
| 2012-12-12 | 281-306-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TX | 903C | SPLENDORA | TX |
| 2008-01-08 | 281-306-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | SPLENDORA | TX |
| 2010-11-29 | 281-306-8XXX | 8000–8999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SPLENDORA | TX |
| 2011-01-27 | 281-306-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | SPLENDORA | TX |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.