NumberResearchThousands-blocks in 518-239
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 518-239 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-04-17 | 518-239-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | OAK HILL | NY |
| 2020-10-15 | 518-239-1XXX | 1000–1999 | Assigned | CATSKILLS COMMUNICATIONS, INC - NY | 360H | OAK HILL | NY |
| 2010-08-24 | 518-239-2XXX | 2000–2999 | Assigned | YMAX COMMUNICATIONS CORP. - NY | 282E | OAK HILL | NY |
| 2018-06-25 | 518-239-3XXX | 3000–3999 | Assigned | SEAMLESS GEOPORT COMM DBA MIDDLEBURGH TELEPHONE LD | 506H | OAK HILL | NY |
| — | 518-239-4XXX | 4000–4999 | Reserved | VERIZON NEW YORK, INC. | 9104 | OAK HILL | NY |
| 2021-05-24 | 518-239-5XXX | 5000–5999 | Assigned | ONVOY, LLC- NY | 384C | OAK HILL | NY |
| — | 518-239-6XXX | 6000–6999 | Reserved | VERIZON NEW YORK, INC. | 9104 | OAK HILL | NY |
| 2016-08-26 | 518-239-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | OAK HILL | NY |
| — | 518-239-8XXX | 8000–8999 | Reserved | VERIZON NEW YORK, INC. | 9104 | OAK HILL | NY |
| — | 518-239-9XXX | 9000–9999 | Available | OAK HILL | 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.