NumberResearchThousands-blocks in 281-712
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 281-712 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 281-712-0XXX | 0000–0999 | Reserved | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | KATY | TX |
| 2005-11-14 | 281-712-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | KATY | TX |
| 2005-11-14 | 281-712-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | KATY | TX |
| — | 281-712-3XXX | 3000–3999 | Reserved | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | KATY | TX |
| 2006-08-21 | 281-712-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | KATY | TX |
| 2006-05-24 | 281-712-5XXX | 5000–5999 | Assigned | ETS TELEPHONE COMPANY, INC. | 2091 | KATY | TX |
| 2010-04-16 | 281-712-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | KATY | TX |
| 2007-08-07 | 281-712-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | KATY | TX |
| 2007-10-15 | 281-712-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | KATY | TX |
| 2012-01-25 | 281-712-9XXX | 9000–9999 | Assigned | ETS TELEPHONE COMPANY, INC. | 2091 | KATY | 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.