NumberResearchThousands-blocks in 858-927
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 858-927 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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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-04-23 | 858-927-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOBRNDO | CA |
| — | 858-927-1XXX | 1000–1999 | Reserved | IP HORIZON LLC | 515J | RNCHOBRNDO | CA |
| — | 858-927-2XXX | 2000–2999 | Reserved | IP HORIZON LLC | 515J | RNCHOBRNDO | CA |
| 2016-02-23 | 858-927-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7147 | RNCHOBRNDO | CA |
| 2017-12-21 | 858-927-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RNCHOBRNDO | CA |
| 2014-12-18 | 858-927-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | RNCHOBRNDO | CA |
| 2014-12-18 | 858-927-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | RNCHOBRNDO | CA |
| 2014-12-18 | 858-927-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | RNCHOBRNDO | CA |
| 2016-01-26 | 858-927-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | RNCHOBRNDO | CA |
| 2016-01-26 | 858-927-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | RNCHOBRNDO | 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.