NumberResearchThousands-blocks in 585-545
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 585-545 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
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-05-12 | 585-545-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | WEBSTER | NY |
| 2010-01-08 | 585-545-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | WEBSTER | NY |
| 2000-10-11 | 585-545-2XXX | 2000–2999 | Assigned | TC SYSTEMS, INC. - NY | 7140 | WEBSTER | NY |
| 2006-07-31 | 585-545-3XXX | 3000–3999 | Assigned | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | WEBSTER | NY |
| 2003-11-24 | 585-545-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | WEBSTER | NY |
| 2006-12-05 | 585-545-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | WEBSTER | NY |
| — | 585-545-6XXX | 6000–6999 | Reserved | PAETEC ITEL, LLC | 829J | WEBSTER | NY |
| — | 585-545-7XXX | 7000–7999 | Reserved | PAETEC ITEL, LLC | 829J | WEBSTER | NY |
| 2005-09-08 | 585-545-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | WEBSTER | NY |
| 2009-09-02 | 585-545-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | WEBSTER | 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.