NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 256-530

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 256-530 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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 3
BANDWIDTH.COM CLEC, LLC - AL 3
ONVOY, LLC - AL 2
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 1
DOVETEL COMMUNICATIONS 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
2014-02-11 256-530-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AL 072F ANNISTON AL
2012-08-20 256-530-1XXX 1000–1999Assigned DOVETEL COMMUNICATIONS LLC - AL 799G ANNISTON AL
2014-02-11 256-530-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AL 072F ANNISTON AL
2014-03-07 256-530-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 ANNISTON AL
2016-06-13 256-530-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AL 072F ANNISTON AL
2015-09-24 256-530-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 ANNISTON AL
2018-02-23 256-530-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 7469 ANNISTON AL
2016-01-26 256-530-7XXX 7000–7999Assigned ONVOY, LLC - AL 604E ANNISTON AL
2016-01-26 256-530-8XXX 8000–8999Assigned ONVOY, LLC - AL 604E ANNISTON AL
2014-10-02 256-530-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 ANNISTON AL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.