NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 256-398

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 256-398 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 256 blocks

Most active assignees, all time — NPA 256
POWERTEL BIRMINGHAM LICENSES, INC. 4
NEW CINGULAR WIRELESS PCS, LLC - GA 2
CHARTER IP ENABLED SERVICES, LLC 2
LEVEL 3 COMMUNICATIONS, LLC - AL 1
BANDWIDTH.COM CLEC, LLC - AL 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
— 256-398-0XXX 0000–0999Reserved POWERTEL BIRMINGHAM LICENSES, INC. 7475 RUSSELLVL AL
2014-10-23 256-398-1XXX 1000–1999Assigned POWERTEL BIRMINGHAM LICENSES, INC. 7475 RUSSELLVL AL
2014-10-23 256-398-2XXX 2000–2999Assigned POWERTEL BIRMINGHAM LICENSES, INC. 7475 RUSSELLVL AL
2007-02-14 256-398-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 RUSSELLVL AL
2016-02-23 256-398-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 RUSSELLVL AL
2015-12-02 256-398-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 RUSSELLVL AL
2015-01-22 256-398-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AL 072F RUSSELLVL AL
2013-10-15 256-398-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K RUSSELLVL AL
2007-09-08 256-398-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K RUSSELLVL AL
— 256-398-9XXX 9000–9999Reserved POWERTEL BIRMINGHAM LICENSES, INC. 7475 RUSSELLVL AL

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.