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
LEVEL 3 COMMUNICATIONS, LLC - LA 24
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
2020-04-06 337-525 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 DE QUINCY LA
2016-01-15 337-607 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 SULPHUR LA
2004-10-20 337-409 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 VINTON LA
2004-10-20 337-415 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 SWEET LAKE LA
2003-09-17 337-376 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 NEW IBERIA LA
2003-09-17 337-378 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LEESVILLE LA
2003-08-08 337-313 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 SULPHUR LA
2002-12-30 337-423 1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LEESVILLE LA
2002-07-24 337-397 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LEESVILLE LA
2002-07-24 337-401 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 DE RIDDER LA
2002-07-24 337-422 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 ABBEVILLE LA
2002-07-24 337-447 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 OPELOUSAS LA
2002-07-24 337-465 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 NEW IBERIA LA
2002-07-24 337-514 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 CROWLEY LA
2002-04-29 337-326 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LAFAYETTE LA
2002-04-29 337-513 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LK CHARLES LA
2002-04-29 337-680 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 STMARTINVL LA
— 337-205 1XXX3XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LAFAYETTE LA
— 337-210 5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LAFAYETTE LA
— 337-214 3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LK CHARLES LA
— 337-404 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LEESVILLE LA
— 337-724 0XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 CHATAIGNIR LA
— 337-735 0XXX4XXX6XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LAFAYETTE LA
— 337-761 6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 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.