NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 337-423

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 337-423 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 337 blocks

Most active assignees, all time — NPA 337
NEW CINGULAR WIRELESS PCS, LLC - GA 4
3
TELEPORT COMMUNICATIONS AMERICA LA - LLC 1
LEVEL 3 COMMUNICATIONS, LLC - LA 1
AT&T ENTERPRISES, LLC 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 337-423-0XXX 0000–0999Reserved LEVEL 3 COMMUNICATIONS, LLC - LA 3232 LEESVILLE LA
2009-02-19 337-423-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LEESVILLE LA
2013-06-17 337-423-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LEESVILLE LA
2014-03-07 337-423-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LEESVILLE LA
2014-03-14 337-423-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA LA - LLC 653C LEESVILLE LA
2011-05-24 337-423-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LEESVILLE LA
2009-01-15 337-423-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LEESVILLE LA
— 337-423-7XXX 7000–7999Assigned (pending) LEESVILLE LA
— 337-423-8XXX 8000–8999Available LEESVILLE LA
— 337-423-9XXX 9000–9999Available LEESVILLE LA

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.