NumberResearchThousands-blocks in 858-798
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026
The ten 1,000-number thousand-blocks inside prefix 858-798 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 |
|---|---|---|---|---|---|---|---|
| — | 858-798-0XXX | 0000–0999 | Reserved | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | RNCHOBRNDO | CA |
| 2006-10-03 | 858-798-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | RNCHOBRNDO | CA |
| 2023-08-02 | 858-798-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | RNCHOBRNDO | CA |
| 2009-01-20 | 858-798-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | RNCHOBRNDO | CA |
| 2015-09-29 | 858-798-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | RNCHOBRNDO | CA |
| 2012-01-13 | 858-798-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RNCHOBRNDO | CA |
| 2014-08-27 | 858-798-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOBRNDO | CA |
| — | 858-798-7XXX | 7000–7999 | Reserved | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | RNCHOBRNDO | CA |
| — | 858-798-8XXX | 8000–8999 | Reserved | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | RNCHOBRNDO | CA |
| 2010-08-18 | 858-798-9XXX | 9000–9999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | RNCHOBRNDO | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.