NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 256-487

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 256-487 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
NEW CINGULAR WIRELESS PCS, LLC - GA 4
ONVOY, LLC - AL 2
TELEPORT COMMUNICATIONS AMERICA, LLC - AL 1
CHARTER IP ENABLED SERVICES, LLC 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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
— 256-487-0XXX 0000–0999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - AL 8271 SYLACAUGA AL
2005-10-17 256-487-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SYLACAUGA AL
2006-08-01 256-487-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SYLACAUGA AL
2006-08-01 256-487-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SYLACAUGA AL
2008-04-18 256-487-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SYLACAUGA AL
2013-11-26 256-487-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 SYLACAUGA AL
2014-02-20 256-487-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K SYLACAUGA AL
2016-01-28 256-487-7XXX 7000–7999Assigned ONVOY, LLC - AL 604E SYLACAUGA AL
2013-02-21 256-487-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C SYLACAUGA AL
2016-01-28 256-487-9XXX 9000–9999Assigned ONVOY, LLC - AL 604E SYLACAUGA 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.