NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 256-676

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 256-676 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
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 4
ONVOY, LLC - AL 3
TERRA NOVA TELECOM INC. 1
CENTURYLINK COMMUNICATIONS, 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
2023-03-31 256-676-0XXX 0000–0999Assigned TERRA NOVA TELECOM INC. 145J ANNISTON AL
2016-06-03 256-676-1XXX 1000–1999Assigned ONVOY, LLC - AL 604E ANNISTON AL
2012-07-26 256-676-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 7469 ANNISTON AL
2006-11-15 256-676-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 7469 ANNISTON AL
2012-07-26 256-676-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 7469 ANNISTON AL
2012-07-26 256-676-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 7469 ANNISTON AL
2016-06-03 256-676-6XXX 6000–6999Assigned ONVOY, LLC - AL 604E ANNISTON AL
2013-10-22 256-676-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ANNISTON AL
2013-08-07 256-676-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 ANNISTON AL
2016-06-03 256-676-9XXX 9000–9999Assigned ONVOY, LLC - AL 604E ANNISTON 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.