NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 323-516

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 323-516 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 323 blocks

Most active assignees, all time — NPA 323
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 4
T-MOBILE USA, INC. 2
CHARTER IP ENABLED SERVICES, LLC 2
UTILITY TELECOM GROUP, LLC - CA 1
TELNYX 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
2018-08-07 323-516-0XXX 0000–0999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MONTEBELLO CA
2017-03-14 323-516-1XXX 1000–1999Assigned TELNYX LLC 073H MONTEBELLO CA
2012-05-21 323-516-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2011-08-23 323-516-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2011-08-23 323-516-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2011-08-23 323-516-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2005-07-27 323-516-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MONTEBELLO CA
2006-05-12 323-516-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MONTEBELLO CA
2005-05-13 323-516-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2005-05-13 323-516-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO 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.