NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 585-351

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 585-351 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
OMNIPOINT COMMUNICATIONS, INC. - NY 3
NEW CINGULAR WIRELESS PCS, LLC - DC 3
PAETEC ITEL, LLC 2
LEVEL 3 COMMUNICATIONS, LLC - NY 1
FRONTIER TELEPHONE OF ROCHESTER, 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
2009-01-23 585-351-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J ROCHESTER NY
2009-02-19 585-351-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2008-11-25 585-351-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2009-02-23 585-351-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2009-11-18 585-351-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2008-07-17 585-351-5XXX 5000–5999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2009-04-06 585-351-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J ROCHESTER NY
2009-12-10 585-351-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2009-02-19 585-351-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2009-02-19 585-351-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 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.