NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 337-387

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 337-387 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
VOICESTREAM GSM I, LLC 5
2
METROPCS, INC. 1
CHARTER IP ENABLED SERVICES, 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
2022-01-14 337-387-0XXX 0000–0999Assigned VOICESTREAM GSM I, LLC 150C WELSH LA
2024-10-17 337-387-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K WELSH LA
2022-01-14 337-387-2XXX 2000–2999Assigned VOICESTREAM GSM I, LLC 150C WELSH LA
2022-01-14 337-387-3XXX 3000–3999Assigned VOICESTREAM GSM I, LLC 150C WELSH LA
2022-01-14 337-387-4XXX 4000–4999Assigned VOICESTREAM GSM I, LLC 150C WELSH LA
— 337-387-5XXX 5000–5999Available WELSH LA
2021-10-18 337-387-6XXX 6000–6999Assigned METROPCS, INC. 5562 WELSH LA
2014-07-01 337-387-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WELSH LA
— 337-387-8XXX 8000–8999Available WELSH LA
— 337-387-9XXX 9000–9999Reserved VOICESTREAM GSM I, LLC 150C WELSH 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.