NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 858-649

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 858-649 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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 2
UTILITY TELECOM GROUP, LLC - CA 1
TWC IP ENABLED SERVICES, LLC 1
T-MOBILE USA, INC. 1
NEW CINGULAR WIRELESS PCS, LLC 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
2018-08-08 858-649-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOBRNDO CA
2012-06-15 858-649-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RNCHOBRNDO CA
2012-07-02 858-649-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOBRNDO CA
2014-06-10 858-649-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO CA
2006-11-15 858-649-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 RNCHOBRNDO CA
— 858-649-5XXX 5000–5999Reserved LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 RNCHOBRNDO CA
2013-04-22 858-649-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K RNCHOBRNDO CA
2014-03-17 858-649-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RNCHOBRNDO CA
2018-11-14 858-649-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO CA
2011-01-21 858-649-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 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.