NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 408-385

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

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

The ten 1,000-number thousand-blocks inside prefix 408-385 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 408 blocks

Most active assignees, all time — NPA 408
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 3
LEVEL 3 COMMUNICATIONS, LLC - CA 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 2
UTILITY TELECOM GROUP, LLC - CA 1
T-MOBILE USA, INC. 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
— 408-385-0XXX 0000–0999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CAMPBELL CA
2004-11-17 408-385-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2010-12-02 408-385-2XXX 2000–2999Assigned IP HORIZON LLC 515J CAMPBELL CA
2004-10-26 408-385-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CAMPBELL CA
2024-03-29 408-385-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMPBELL CA
2003-06-20 408-385-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2021-03-15 408-385-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMPBELL CA
2006-03-22 408-385-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CAMPBELL CA
— 408-385-8XXX 8000–8999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CAMPBELL CA
2009-09-23 408-385-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.