NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 858-598

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 858-598 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
TWC IP ENABLED SERVICES, LLC 2
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 2
BANDWIDTH.COM CLEC, LLC - CA 2
UTILITY TELECOM GROUP, LLC - CA 1
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 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
2012-10-01 858-598-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG LVTA CA
— 858-598-1XXX 1000–1999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG LVTA CA
2008-08-05 858-598-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG LVTA CA
2008-10-22 858-598-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG LVTA CA
2008-10-22 858-598-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG LVTA CA
2007-12-03 858-598-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG LVTA CA
2007-12-03 858-598-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG LVTA CA
2008-04-02 858-598-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNDG LVTA CA
2008-08-19 858-598-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNDG LVTA CA
2012-10-01 858-598-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG LVTA 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.