NumberResearchThousands-blocks in 585-431
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 585-431 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2000-04-05 | 585-431-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | BROCKPORT | NY |
| 2007-07-23 | 585-431-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | BROCKPORT | NY |
| 2010-09-14 | 585-431-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | BROCKPORT | NY |
| 2010-06-01 | 585-431-3XXX | 3000–3999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | BROCKPORT | NY |
| 2011-05-04 | 585-431-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | BROCKPORT | NY |
| 2013-05-15 | 585-431-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | BROCKPORT | NY |
| 2015-03-13 | 585-431-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | BROCKPORT | NY |
| 2014-09-03 | 585-431-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BROCKPORT | NY |
| 2016-01-11 | 585-431-8XXX | 8000–8999 | Assigned | INTEGRATED PATH COMMUNICATIONS, LLC - NY | 271G | BROCKPORT | NY |
| 2017-03-15 | 585-431-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | BROCKPORT | 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.