NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 337-550

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 337-550 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
BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 3
TERRA NOVA TELECOM INC. 1
PAETEC ITEL, LLC 1
LOUISIANA COMPETITIVE TELECOMMUNICATIONS, INC. 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
2022-08-04 337-550-0XXX 0000–0999Assigned TERRA NOVA TELECOM INC. 145J EUNICE LA
— 337-550-1XXX 1000–1999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 EUNICE LA
— 337-550-2XXX 2000–2999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 EUNICE LA
— 337-550-3XXX 3000–3999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 EUNICE LA
2005-02-11 337-550-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 EUNICE LA
2005-02-11 337-550-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 EUNICE LA
2010-09-07 337-550-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J EUNICE LA
2014-08-07 337-550-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EUNICE LA
2014-04-01 337-550-8XXX 8000–8999Assigned LOUISIANA COMPETITIVE TELECOMMUNICATIONS, INC. 4930 EUNICE LA
2014-08-21 337-550-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 EUNICE 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.