NumberResearchThousands-blocks in 858-800
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 858-800 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-09-30 | 858-800-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | SNDG MRMS | CA |
| 2012-03-12 | 858-800-1XXX | 1000–1999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNDG MRMS | CA |
| 2012-03-21 | 858-800-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SNDG MRMS | CA |
| 2012-08-03 | 858-800-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNDG MRMS | CA |
| 2013-01-29 | 858-800-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SNDG MRMS | CA |
| 2012-05-14 | 858-800-5XXX | 5000–5999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SNDG MRMS | CA |
| 2012-08-23 | 858-800-6XXX | 6000–6999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SNDG MRMS | CA |
| 2013-04-22 | 858-800-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNDG MRMS | CA |
| 2011-09-30 | 858-800-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | SNDG MRMS | CA |
| 2021-06-23 | 858-800-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SNDG MRMS | 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.