NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 209-923

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 209-923 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 209 blocks

Most active assignees, all time — NPA 209
NEW CINGULAR WIRELESS PCS, LLC 4
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 2
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 1
COMCAST PHONE OF CALIFORNIA, 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
2005-04-14 209-923-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MANTECA CA
2006-01-23 209-923-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MANTECA CA
2006-01-23 209-923-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MANTECA CA
2004-04-09 209-923-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MANTECA CA
2006-07-18 209-923-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MANTECA CA
2017-04-10 209-923-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MANTECA CA
2007-02-09 209-923-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 MANTECA CA
2005-11-23 209-923-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MANTECA CA
2008-08-25 209-923-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J MANTECA CA
2004-07-07 209-923-9XXX 9000–9999Assigned AT&T - LOCAL 7421 MANTECA 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.