NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 310-765

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 310-765 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
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 5
LEVEL 3 COMMUNICATIONS, LLC - CA 2
UTILITY TELECOM GROUP, LLC - CA 1
ONVOY, LLC - CA 1
NEW CINGULAR WIRELESS PCS, 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2006-08-04 310-765-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL SEGUNDO CA
— 310-765-1XXX 1000–1999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL SEGUNDO CA
— 310-765-2XXX 2000–2999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL SEGUNDO CA
— 310-765-3XXX 3000–3999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL SEGUNDO CA
2001-02-19 310-765-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
— 310-765-5XXX 5000–5999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL SEGUNDO CA
2006-08-01 310-765-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2005-08-16 310-765-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C EL SEGUNDO CA
2006-05-12 310-765-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 EL SEGUNDO CA
— 310-765-9XXX 9000–9999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL SEGUNDO 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.