NumberResearchThousands-blocks in 518-539
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 518-539 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
Jul 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 |
|---|---|---|---|---|---|---|---|
| 2006-10-24 | 518-539-0XXX | 0000–0999 | Assigned | RINGSQUARED TELECOM LLC | 8249 | MECHANICVL | NY |
| 2008-04-17 | 518-539-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | MECHANICVL | NY |
| 2005-02-25 | 518-539-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | MECHANICVL | NY |
| 2010-09-22 | 518-539-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | MECHANICVL | NY |
| 2012-12-20 | 518-539-4XXX | 4000–4999 | Assigned | ONVOY, LLC- NY | 384C | MECHANICVL | NY |
| 2021-09-08 | 518-539-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | MECHANICVL | NY |
| 2018-09-13 | 518-539-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | MECHANICVL | NY |
| 2008-05-01 | 518-539-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | MECHANICVL | NY |
| 2015-12-16 | 518-539-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF NEW YORK, LLC - NY | 155E | MECHANICVL | NY |
| — | 518-539-9XXX | 9000–9999 | Reserved | TC SYSTEMS, INC. - NY | 7140 | MECHANICVL | 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.