NumberResearchThousands-blocks in 909-583
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 909-583 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 909 blocks
Most active assignees, all time — NPA 909
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-03-02 | 909-583-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | REDLANDS | CA |
| 2005-10-11 | 909-583-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | REDLANDS | CA |
| — | 909-583-2XXX | 2000–2999 | Reserved | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | REDLANDS | CA |
| 2005-10-11 | 909-583-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | REDLANDS | CA |
| 2005-07-21 | 909-583-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | REDLANDS | CA |
| 2006-10-23 | 909-583-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | REDLANDS | CA |
| — | 909-583-6XXX | 6000–6999 | Reserved | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | REDLANDS | CA |
| 2004-12-08 | 909-583-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | REDLANDS | CA |
| 2005-03-02 | 909-583-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | REDLANDS | CA |
| 2002-05-23 | 909-583-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | REDLANDS | 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.