NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 585
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-12-19 | 585-484-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2013-12-19 | 585-484-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2013-12-19 | 585-484-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2013-12-19 | 585-484-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2013-12-19 | 585-484-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2013-06-18 | 585-446-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | W WEBSTER | NY |
| 2011-05-04 | 585-431-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | BROCKPORT | NY |
| 2011-01-18 | 585-617-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | SPENCERPT | NY |
| 2010-12-09 | 585-366-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | HILTON | NY |
| 2009-06-09 | 585-743-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2009-06-09 | 585-743-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2007-06-22 | 585-678-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | FAIRPORT | NY |
| 2006-07-31 | 585-643-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | EROCHESTER | NY |
| 2006-05-19 | 585-487-1XXX | 1000–1999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | HENRIETTA | NY |
| 2005-03-22 | 585-571-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | SCOTTSVL | NY |
| 2004-10-08 | 585-502-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | LE ROY | NY |
| 2004-09-01 | 585-662-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | EROCHESTER | NY |
| 2004-02-23 | 585-293-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | CHURCHVL | NY |
| 2002-10-15 | 585-899-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | EROCHESTER | NY |
| 2001-11-15 | 585-333-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2001-10-23 | 585-419-9XXX | 9000–9999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | EROCHESTER | NY |
| 2000-10-17 | 585-506-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | ROCHESTER | NY |
| 2000-06-06 | 585-346-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | LIVONIA | NY |
| 2000-04-07 | 585-217-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | WEBSTER | NY |
| 2000-04-07 | 585-347-1XXX | 1000–1999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | W WEBSTER | NY |
| 2000-04-07 | 585-533-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | RUSH | NY |
| 2000-04-07 | 585-869-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | VICTOR | NY |
| 2000-04-06 | 585-226-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | AVON | NY |
| 2000-04-06 | 585-419-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | EROCHESTER | NY |
| 2000-04-06 | 585-538-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | CALEDONIA | NY |
| 2000-04-06 | 585-582-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | HONEOYEFLS | NY |
| 2000-04-06 | 585-598-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | FAIRPORT | NY |
| 2000-04-06 | 585-919-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | CANANDAGUA | NY |
| 2000-04-06 | 585-991-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | GENESEO | 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.