NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 585-998

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 585-998 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
YORKSTREAM COMMUNICATIONS LLC 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 3
NEW CINGULAR WIRELESS PCS, LLC - DC 2
NUSO, LLC 1
BOOST SUBSCRIBERCO L.L.C. 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
2025-04-08 585-998-0XXX 0000–0999Assigned YORKSTREAM COMMUNICATIONS LLC 977K ROCHESTER NY
2026-02-03 585-998-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2025-05-05 585-998-2XXX 2000–2999Assigned NUSO, LLC 732J ROCHESTER NY
2026-02-03 585-998-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2025-09-23 585-998-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2026-07-22 585-998-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2025-08-28 585-998-6XXX 6000–6999Assigned BOOST SUBSCRIBERCO L.L.C. 490J ROCHESTER NY
2025-09-23 585-998-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2025-04-08 585-998-8XXX 8000–8999Assigned YORKSTREAM COMMUNICATIONS LLC 977K ROCHESTER NY
2025-04-08 585-998-9XXX 9000–9999Assigned YORKSTREAM COMMUNICATIONS LLC 977K ROCHESTER 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.