NumberResearchThousands-blocks in 858-369
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 858-369 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 858 blocks
Most active assignees, all time — NPA 858
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-04-22 | 858-369-0XXX | 0000–0999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | DEL MAR | CA |
| 2021-06-24 | 858-369-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | DEL MAR | CA |
| — | 858-369-2XXX | 2000–2999 | Reserved | AT&T - LOCAL | 7421 | DEL MAR | CA |
| 2007-02-27 | 858-369-3XXX | 3000–3999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | DEL MAR | CA |
| — | 858-369-4XXX | 4000–4999 | Reserved | AT&T - LOCAL | 7421 | DEL MAR | CA |
| 2006-07-11 | 858-369-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | DEL MAR | CA |
| 2014-04-23 | 858-369-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2008-10-20 | 858-369-7XXX | 7000–7999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | DEL MAR | CA |
| 2002-10-08 | 858-369-8XXX | 8000–8999 | Assigned | PACIFIC BELL | 9740 | DEL MAR | CA |
| 2023-07-12 | 858-369-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | DEL MAR | CA |
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.