NumberResearchThousands-blocks in 585-617
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
The ten 1,000-number thousand-blocks inside prefix 585-617 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
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2007-07-23 | 585-617-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SPENCERPT | NY |
| 2003-04-23 | 585-617-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | SPENCERPT | NY |
| 2002-03-06 | 585-617-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | SPENCERPT | NY |
| 2010-06-02 | 585-617-3XXX | 3000–3999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SPENCERPT | NY |
| 2003-12-23 | 585-617-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SPENCERPT | NY |
| 2008-06-20 | 585-617-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SPENCERPT | NY |
| 2004-06-29 | 585-617-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | SPENCERPT | NY |
| 2019-05-15 | 585-617-7XXX | 7000–7999 | Assigned | TC SYSTEMS, INC. - NY | 7140 | SPENCERPT | NY |
| 2011-01-18 | 585-617-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | SPENCERPT | NY |
| 2002-03-06 | 585-617-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | SPENCERPT | 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.