NumberResearchThousands-blocks in 781-451
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026
The ten 1,000-number thousand-blocks inside prefix 781-451 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-04-08 | 781-451-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | WAKEFIELD | MA |
| 2006-03-13 | 781-451-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WAKEFIELD | MA |
| — | 781-451-2XXX | 2000–2999 | Reserved | TC SYSTEMS, INC. | 7135 | WAKEFIELD | MA |
| 2004-08-09 | 781-451-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WAKEFIELD | MA |
| — | 781-451-4XXX | 4000–4999 | Reserved | TC SYSTEMS, INC. | 7135 | WAKEFIELD | MA |
| 2026-06-12 | 781-451-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | WAKEFIELD | MA |
| 2006-08-17 | 781-451-6XXX | 6000–6999 | Assigned | FREEDOM RING COMMUNICATIONS, LLC | 8468 | WAKEFIELD | MA |
| 2009-08-11 | 781-451-7XXX | 7000–7999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | WAKEFIELD | MA |
| 2008-02-08 | 781-451-8XXX | 8000–8999 | Assigned | YMAX COMMUNICATIONS CORP. - MA | 316E | WAKEFIELD | MA |
| — | 781-451-9XXX | 9000–9999 | Reserved | BANDWIDTH.COM CLEC, LLC - MA | 990E | WAKEFIELD | MA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.