NumberResearchThousands-blocks in 518-336
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 518-336 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 518 blocks
Most active assignees, all time — NPA 518
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-12-29 | 518-336-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | CASTLETON | NY |
| 2002-08-07 | 518-336-1XXX | 1000–1999 | Assigned | TVC ALBANY, INC. DBA FIRSTLIGHT FIBER | 7989 | CASTLETON | NY |
| 2006-04-14 | 518-336-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | CASTLETON | NY |
| 2006-03-14 | 518-336-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | CASTLETON | NY |
| 2005-07-08 | 518-336-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | CASTLETON | NY |
| 2010-10-20 | 518-336-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | CASTLETON | NY |
| 2010-02-01 | 518-336-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | CASTLETON | NY |
| 2012-03-05 | 518-336-7XXX | 7000–7999 | Assigned | ONVOY, LLC- NY | 384C | CASTLETON | NY |
| 2012-07-27 | 518-336-8XXX | 8000–8999 | Assigned | ONVOY, LLC- NY | 384C | CASTLETON | NY |
| — | 518-336-9XXX | 9000–9999 | Reserved | TC SYSTEMS, INC. - NY | 7140 | CASTLETON | 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.