NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 858-768

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

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 858-768 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
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 4
LEVEL 3 COMMUNICATIONS, LLC - CA 2
TERRA NOVA TELECOM INC. 1
T-MOBILE USA, INC. 1
ONVOY, LLC - CA 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2007-09-26 858-768-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2008-04-24 858-768-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2007-09-07 858-768-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2007-02-27 858-768-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2007-02-27 858-768-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2007-02-27 858-768-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2006-09-27 858-768-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2007-02-27 858-768-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2022-04-28 858-768-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2025-01-15 858-768-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J LA JOLLA 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.