NumberResearchThousands-blocks in 281-937
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 281-937 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
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 281-937-0XXX | 0000–0999 | Reserved | SOUTHWESTERN BELL | 9533 | SMITHERSLK | TX |
| — | 281-937-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | SMITHERSLK | TX |
| 2010-10-04 | 281-937-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | SMITHERSLK | TX |
| 2011-05-05 | 281-937-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TX | 903C | SMITHERSLK | TX |
| 2011-01-27 | 281-937-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | SMITHERSLK | TX |
| 2025-02-03 | 281-937-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | SMITHERSLK | TX |
| 2025-02-03 | 281-937-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SMITHERSLK | TX |
| 2006-12-01 | 281-937-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | SMITHERSLK | TX |
| 2013-04-02 | 281-937-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF TEXAS, LLC - TX | 177F | SMITHERSLK | TX |
| — | 281-937-9XXX | 9000–9999 | Reserved | SOUTHWESTERN BELL | 9533 | SMITHERSLK | 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.