NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 323-450

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 323-450 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 323 blocks

Most active assignees, all time — NPA 323
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 5
TWC IP ENABLED SERVICES, LLC 1
NEW CINGULAR WIRELESS PCS, LLC 1
METROPCS NETWORKS, LLC 1
LEVEL 3 COMMUNICATIONS, 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
— 323-450-0XXX 0000–0999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 14 CA
— 323-450-1XXX 1000–1999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 14 CA
2011-06-03 323-450-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 14 CA
— 323-450-3XXX 3000–3999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 14 CA
— 323-450-4XXX 4000–4999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 14 CA
2007-07-11 323-450-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2003-08-05 323-450-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 14 CA
2012-12-31 323-450-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 14 CA
— 323-450-8XXX 8000–8999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 14 CA
2010-09-21 323-450-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 14 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.