NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 228-223

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 228-223 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 228 blocks

Most active assignees, all time — NPA 228
NEW CINGULAR WIRELESS PCS, LLC - GA 9
CELLULAR SOUTH, INC. 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
2005-10-28 228-223-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2004-07-06 228-223-1XXX 1000–1999Assigned CELLULAR SOUTH, INC. 6581 GULFPORT MS
2005-09-22 228-223-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2005-09-22 228-223-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2005-02-08 228-223-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2005-02-08 228-223-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2005-02-08 228-223-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2004-10-06 228-223-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2004-10-06 228-223-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2004-02-18 228-223-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS

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.