NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 256-217

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 256-217 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
BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 5
LEVEL 3 COMMUNICATIONS, LLC - AL 4
TERRA NOVA TELECOM INC. 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
— 256-217-0XXX 0000–0999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 HUNTSVILLE AL
— 256-217-1XXX 1000–1999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 HUNTSVILLE AL
— 256-217-2XXX 2000–2999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 HUNTSVILLE AL
2022-09-07 256-217-3XXX 3000–3999Assigned TERRA NOVA TELECOM INC. 145J HUNTSVILLE AL
2007-11-06 256-217-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2010-11-17 256-217-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
— 256-217-6XXX 6000–6999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 HUNTSVILLE AL
2008-01-17 256-217-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
— 256-217-8XXX 8000–8999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 HUNTSVILLE AL
2010-11-17 256-217-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE 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.