NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 828-523

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 828-523 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 828 blocks

Most active assignees, all time — NPA 828
ONVOY, LLC - NC 5
LEVEL 3 COMMUNICATIONS, LLC - NC 2
2
TELEPORT COMMUNICATIONS AMERICA, LLC - NC 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
— 828-523-0XXX 0000–0999Reserved LEVEL 3 COMMUNICATIONS, LLC - NC 3235 GRANITEFLS NC
2023-08-14 828-523-1XXX 1000–1999Assigned ONVOY, LLC - NC 638E GRANITEFLS NC
2021-03-01 828-523-2XXX 2000–2999Assigned ONVOY, LLC - NC 638E GRANITEFLS NC
2021-03-01 828-523-3XXX 3000–3999Assigned ONVOY, LLC - NC 638E GRANITEFLS NC
— 828-523-4XXX 4000–4999Reserved LEVEL 3 COMMUNICATIONS, LLC - NC 3235 GRANITEFLS NC
— 828-523-5XXX 5000–5999Available GRANITEFLS NC
2015-10-14 828-523-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - NC 8389 GRANITEFLS NC
— 828-523-7XXX 7000–7999Available GRANITEFLS NC
2019-02-11 828-523-8XXX 8000–8999Assigned ONVOY, LLC - NC 638E GRANITEFLS NC
2019-02-11 828-523-9XXX 9000–9999Assigned ONVOY, LLC - NC 638E GRANITEFLS NC

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.