NumberResearchThousands-blocks in 781-399
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 781-399 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 |
|---|---|---|---|---|---|---|---|
| 2004-12-02 | 781-399-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MALDEN | MA |
| 2021-05-10 | 781-399-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | MALDEN | MA |
| 2025-09-10 | 781-399-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MALDEN | MA |
| — | 781-399-3XXX | 3000–3999 | Available | MALDEN | MA | ||
| — | 781-399-4XXX | 4000–4999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MALDEN | MA |
| 2011-07-20 | 781-399-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | MALDEN | MA |
| — | 781-399-6XXX | 6000–6999 | Available | MALDEN | MA | ||
| 2011-05-09 | 781-399-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | MALDEN | MA |
| 2024-02-08 | 781-399-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MA | 892D | MALDEN | MA |
| — | 781-399-9XXX | 9000–9999 | Available | MALDEN | 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.