NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 337-350

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

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

The ten 1,000-number thousand-blocks inside prefix 337-350 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 3
COMCAST IP PHONE, LLC 2
BANDWIDTH.COM CLEC, LLC - LA 2
PAETEC ITEL, LLC 1
CENTURYLINK COMMUNICATIONS, 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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 337-350-0XXX 0000–0999Reserved NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CENTERVL LA
— 337-350-1XXX 1000–1999Reserved NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CENTERVL LA
2004-07-07 337-350-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CENTERVL LA
2012-01-06 337-350-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - LA 153F CENTERVL LA
2011-04-29 337-350-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CENTERVL LA
2017-12-12 337-350-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CENTERVL LA
2005-04-26 337-350-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CENTERVL LA
2014-08-07 337-350-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CENTERVL LA
2015-08-28 337-350-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - LA 153F CENTERVL LA
— 337-350-9XXX 9000–9999Reserved NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CENTERVL LA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.