NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 423-813

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 423-813 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 423 blocks

Most active assignees, all time — NPA 423
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 3
POWERTEL ATLANTA LICENSES, INC. 2
ONVOY, LLC - TN 2
CHARTER IP ENABLED SERVICES, LLC 1
BANDWIDTH.COM CLEC, LLC - TN 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
2016-01-11 423-813-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CLEVELAND TN
2019-05-24 423-813-1XXX 1000–1999Assigned ONVOY, LLC - TN 525E CLEVELAND TN
2024-12-12 423-813-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CLEVELAND TN
2016-06-22 423-813-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F CLEVELAND TN
2016-09-21 423-813-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CLEVELAND TN
2021-12-14 423-813-5XXX 5000–5999Assigned POWERTEL ATLANTA LICENSES, INC. 7473 CLEVELAND TN
2021-12-14 423-813-6XXX 6000–6999Assigned POWERTEL ATLANTA LICENSES, INC. 7473 CLEVELAND TN
2016-02-17 423-813-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CLEVELAND TN
2019-05-24 423-813-8XXX 8000–8999Assigned ONVOY, LLC - TN 525E CLEVELAND TN
2015-10-09 423-813-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CLEVELAND TN

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.