NumberResearchThousands-blocks in 951-256
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 951-256 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 951 blocks
Most active assignees, all time — NPA 951
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2003-07-08 | 951-256-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CORONA | CA |
| 2009-10-22 | 951-256-1XXX | 1000–1999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | CORONA | CA |
| 2001-05-14 | 951-256-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | CORONA | CA |
| 2001-06-15 | 951-256-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | CORONA | CA |
| 2002-04-12 | 951-256-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CORONA | CA |
| 2003-04-14 | 951-256-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CORONA | CA |
| 2005-07-07 | 951-256-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | CORONA | CA |
| 2004-11-11 | 951-256-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CORONA | CA |
| 2000-12-08 | 951-256-8XXX | 8000–8999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CORONA | CA |
| — | 951-256-9XXX | 9000–9999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | CORONA | CA |
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.