NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 423-217

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 423-217 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
NEW CINGULAR WIRELESS PCS, LLC - GA 6
CHARTER IP ENABLED SERVICES, LLC 2
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 1
LEVEL 3 COMMUNICATIONS, 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
2004-12-29 423-217-0XXX 0000–0999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BRISTOL TN
2006-03-21 423-217-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BRISTOL TN
2006-10-09 423-217-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
2008-08-12 423-217-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
— 423-217-4XXX 4000–4999Reserved LEVEL 3 COMMUNICATIONS, LLC - TN 4806 BRISTOL TN
2007-01-09 423-217-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
2007-02-26 423-217-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 7278 BRISTOL TN
2007-08-02 423-217-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
2007-08-09 423-217-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
2008-10-03 423-217-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL 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.