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 337
VOICESTREAM GSM I, LLC 18
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
2023-10-05 337-618 0XXX1XXX2XXX7XXX8XXX9XXX · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C BREAUX BDG LA
2022-02-24 337-574 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C DE RIDDER LA
2021-10-19 337-567 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C BREAUX BDG LA
2005-09-02 337-630 0XXX2XXX3XXX9XXX · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C CAMERON LA
2004-03-19 337-300 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C ELTON LA
2004-03-19 337-320 0XXX which blocks → VOICESTREAM GSM I, LLC 150C OBERLIN LA
2004-03-19 337-387 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C WELSH LA
2004-03-19 337-389 1XXX6XXX7XXX9XXX · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C OBERLIN LA
2004-03-19 337-390 0XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KINDER LA
2002-12-30 337-348 0XXX4XXX5XXX · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C DE RIDDER LA
2002-12-30 337-424 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C LEESVILLE LA
2001-11-01 337-292 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C LK CHARLES LA
2001-10-26 337-780 0XXX4XXX5XXX6XXX7XXX8XXX which blocks → VOICESTREAM GSM I, LLC 150C LAFAYETTE LA
2001-08-23 337-255 not yet reported which blocks → VOICESTREAM GSM I, LLC 150C LAFAYETTE LA
— 337-693 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C LAFAYETTE LA
— 337-739 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C LAFAYETTE LA
— 337-781 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C LAFAYETTE LA
— 337-787 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C LAFAYETTE LA

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.