NumberResearch Membership · Data 09/21/2026

Thousands-blocks in 925-453

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026

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

The ten 1,000-number thousand-blocks inside prefix 925-453 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 925 blocks

Most active assignees, all time — NPA 925
ONVOY, LLC - CA 2
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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
2017-05-18 925-453-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C LIVERMORE CA
2011-07-11 925-453-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LIVERMORE CA
2012-12-05 925-453-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C LIVERMORE CA
— 925-453-3XXX 3000–3999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LIVERMORE CA
— 925-453-4XXX 4000–4999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LIVERMORE CA
2006-05-10 925-453-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LIVERMORE CA
2014-07-02 925-453-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LIVERMORE CA
2010-01-18 925-453-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LIVERMORE CA
2013-08-21 925-453-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LIVERMORE CA
2016-06-27 925-453-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LIVERMORE CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.