NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 650-931

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 650-931 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 650 blocks

Most active assignees, all time — NPA 650
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 6
T-MOBILE USA, INC. 2
LEVEL 3 COMMUNICATIONS, 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
— 650-931-0XXX 0000–0999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO CA
— 650-931-1XXX 1000–1999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO CA
— 650-931-2XXX 2000–2999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO CA
— 650-931-3XXX 3000–3999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO CA
2007-03-07 650-931-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2008-04-08 650-931-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SAN MATEO CA
2009-06-23 650-931-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
2007-04-16 650-931-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-931-8XXX 8000–8999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO CA
— 650-931-9XXX 9000–9999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO 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.