NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 310-627

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 310-627 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 310 blocks

Most active assignees, all time — NPA 310
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 2
T-MOBILE USA, INC. 2
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 2
TWC IP ENABLED SERVICES, LLC 1
ONVOY, 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
2012-10-09 310-627-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CMTN CMTN CA
2012-10-09 310-627-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CMTN CMTN CA
2012-12-19 310-627-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CMTN CMTN CA
2013-01-30 310-627-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CMTN CMTN CA
2013-01-22 310-627-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CMTN CMTN CA
2013-01-22 310-627-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CMTN CMTN CA
2013-02-01 310-627-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2012-11-20 310-627-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2013-02-27 310-627-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CMTN CMTN CA
2013-03-12 310-627-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K CMTN CMTN 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.