NumberResearchThousands-blocks in 413-728
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 413-728 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 413 blocks
Most active assignees, all time — NPA 413
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 413-728-0XXX | 0000–0999 | Reserved | BANDWIDTH.COM CLEC, LLC - MA | 990E | LENOX | MA |
| 2019-06-03 | 413-728-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | LENOX | MA |
| — | 413-728-2XXX | 2000–2999 | Reserved | BANDWIDTH.COM CLEC, LLC - MA | 990E | LENOX | MA |
| — | 413-728-3XXX | 3000–3999 | Available | LENOX | MA | ||
| — | 413-728-4XXX | 4000–4999 | Reserved | BANDWIDTH.COM CLEC, LLC - MA | 990E | LENOX | MA |
| 2002-05-20 | 413-728-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LENOX | MA |
| 2010-05-03 | 413-728-6XXX | 6000–6999 | Assigned | TC SYSTEMS, INC. | 7135 | LENOX | MA |
| 2015-03-17 | 413-728-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LENOX | MA |
| 2004-06-29 | 413-728-8XXX | 8000–8999 | Assigned | RINGSQUARED TELECOM LLC | 3849 | LENOX | MA |
| — | 413-728-9XXX | 9000–9999 | Reserved | BANDWIDTH.COM CLEC, LLC - MA | 990E | LENOX | 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.