NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 228
NEW CINGULAR WIRELESS PCS, LLC - GA 26
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2026-02-27 228-339 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2025-04-25 228-303 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2025-04-25 228-306 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2025-03-14 228-302 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2024-12-13 228-301 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2024-03-14 228-293 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2021-12-06 228-278 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 OCEAN SPG MS
2008-10-03 228-331 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2006-05-11 228-287 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2004-02-18 228-223 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
2002-04-03 228-229 0XXX1XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
2001-03-08 228-238 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 OCEAN SPG MS
— 228-243 4XXX5XXX6XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
— 228-276 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
— 228-324 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
— 228-326 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
— 228-327 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 OCEAN SPG MS
— 228-332 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PASSCHRSTN MS
— 228-342 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BAYSTLOUIS MS
— 228-344 1XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BAYSTLOUIS MS
— 228-465 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS
— 228-596 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
— 228-623 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PASCAGOULA MS
— 228-627 1XXX2XXX4XXX5XXX7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PASCAGOULA MS
— 228-731 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GULFPORT MS
— 228-806 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BILOXI MS

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.