NumberResearchThousands-blocks in 585-563
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 585-563 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
Aug 2026
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Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-01-23 | 585-563-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | ROCHESTER | NY |
| 2005-06-22 | 585-563-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | ROCHESTER | NY |
| 2006-03-07 | 585-563-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | ROCHESTER | NY |
| 2006-03-07 | 585-563-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | ROCHESTER | NY |
| 2005-06-22 | 585-563-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | ROCHESTER | NY |
| 2010-08-13 | 585-563-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | ROCHESTER | NY |
| 2005-10-07 | 585-563-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | ROCHESTER | NY |
| 2005-10-07 | 585-563-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | ROCHESTER | NY |
| 2010-08-13 | 585-563-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | ROCHESTER | NY |
| 2007-06-07 | 585-563-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | 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.