NumberResearchThousands-blocks in 413-203
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 413-203 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
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-02-17 | 413-203-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | EASTHAMPTN | MA |
| 2005-10-17 | 413-203-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | EASTHAMPTN | MA |
| 2012-06-26 | 413-203-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | EASTHAMPTN | MA |
| 2004-03-01 | 413-203-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | EASTHAMPTN | MA |
| 2004-03-11 | 413-203-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | EASTHAMPTN | MA |
| 2007-11-12 | 413-203-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | EASTHAMPTN | MA |
| 2006-04-28 | 413-203-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | EASTHAMPTN | MA |
| — | 413-203-7XXX | 7000–7999 | Available | EASTHAMPTN | MA | ||
| 2007-02-07 | 413-203-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | EASTHAMPTN | MA |
| 2010-09-22 | 413-203-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | EASTHAMPTN | MA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.