NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 731-438

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 731-438 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 731 blocks

Most active assignees, all time — NPA 731
NEW CINGULAR WIRELESS PCS, LLC - GA 5
LEVEL 3 COMMUNICATIONS, LLC - TN 2
ONVOY, LLC - TN 1
CHARTER IP ENABLED SERVICES, LLC 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 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
2005-03-28 731-438-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SAVANNAH TN
2005-06-23 731-438-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SAVANNAH TN
2005-07-15 731-438-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SAVANNAH TN
2005-11-09 731-438-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K SAVANNAH TN
— 731-438-4XXX 4000–4999Reserved LEVEL 3 COMMUNICATIONS, LLC - TN 4806 SAVANNAH TN
2006-08-21 731-438-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SAVANNAH TN
2023-08-31 731-438-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 SAVANNAH TN
2005-12-12 731-438-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SAVANNAH TN
2006-01-31 731-438-8XXX 8000–8999Assigned ONVOY, LLC - TN 525E SAVANNAH TN
2007-03-21 731-438-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 SAVANNAH TN

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.