NumberResearchThousands-blocks in 781-421
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 781-421 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 |
|---|---|---|---|---|---|---|---|
| 2013-04-05 | 781-421-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | ROCKLAND | MA |
| 2015-02-24 | 781-421-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ROCKLAND | MA |
| 2004-09-30 | 781-421-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | ROCKLAND | MA |
| 2010-02-18 | 781-421-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | ROCKLAND | MA |
| 2026-04-06 | 781-421-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ROCKLAND | MA |
| 2009-03-27 | 781-421-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ROCKLAND | MA |
| 2012-10-11 | 781-421-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | ROCKLAND | MA |
| 2022-08-30 | 781-421-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MA | 892D | ROCKLAND | MA |
| 2022-08-23 | 781-421-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | ROCKLAND | MA |
| 2016-06-01 | 781-421-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ROCKLAND | 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.