NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 517-526

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 517-526 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 517 blocks

Most active assignees, all time — NPA 517
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 8
TELEPORT COMMUNICATIONS AMERICA, LLC - MI 1
AT&T ENTERPRISES, LLC 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
— 517-526-0XXX 0000–0999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
— 517-526-1XXX 1000–1999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
— 517-526-2XXX 2000–2999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
— 517-526-3XXX 3000–3999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
— 517-526-4XXX 4000–4999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
— 517-526-5XXX 5000–5999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
2011-05-25 517-526-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PORTLAND MI
2011-08-03 517-526-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
— 517-526-8XXX 8000–8999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
2011-05-18 517-526-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C PORTLAND MI

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.