NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 585-526

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 585-526 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 585 blocks

Most active assignees, all time — NPA 585
FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 7
TWC IP ENABLED SERVICES, LLC 1
ONVOY, LLC- NY 1
LEVEL 3 COMMUNICATIONS, LLC - NY 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
— 585-526-0XXX 0000–0999Reserved FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY
— 585-526-1XXX 1000–1999Reserved FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY
2010-06-02 585-526-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K STANLEY NY
2014-09-03 585-526-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 STANLEY NY
— 585-526-4XXX 4000–4999Reserved FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY
— 585-526-5XXX 5000–5999Reserved FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY
— 585-526-6XXX 6000–6999Reserved FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY
— 585-526-7XXX 7000–7999Reserved FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY
2017-03-15 585-526-8XXX 8000–8999Assigned ONVOY, LLC- NY 384C STANLEY NY
— 585-526-9XXX 9000–9999Reserved FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY

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.