NumberResearchThousands-blocks in 781-517
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 781-517 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 781 blocks
Most active assignees, all time — NPA 781
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 781-517-0XXX | 0000–0999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MELROSE | MA |
| — | 781-517-1XXX | 1000–1999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MELROSE | MA |
| 2002-09-25 | 781-517-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | MELROSE | MA |
| 2004-08-09 | 781-517-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MELROSE | MA |
| — | 781-517-4XXX | 4000–4999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MELROSE | MA |
| 2023-06-09 | 781-517-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MA | 892D | MELROSE | MA |
| 2010-09-22 | 781-517-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | MELROSE | MA |
| 2006-11-16 | 781-517-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MELROSE | MA |
| 2011-12-08 | 781-517-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | MELROSE | MA |
| 2021-11-02 | 781-517-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MELROSE | MA |
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.