NumberResearchThousands-blocks in 603-565
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 603-565 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 603 blocks
Most active assignees, all time — NPA 603
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 |
|---|---|---|---|---|---|---|---|
| 2005-08-19 | 603-565-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NH | 4017 | PENACOOK | NH |
| 2006-04-21 | 603-565-1XXX | 1000–1999 | Assigned | FREEDOM RING COMMUNICATIONS, LLC | 8468 | PENACOOK | NH |
| 2002-09-07 | 603-565-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - NH | 996E | PENACOOK | NH |
| 2023-03-31 | 603-565-3XXX | 3000–3999 | Assigned | IDT AMERICA, CORP. - NH | 314C | PENACOOK | NH |
| — | 603-565-4XXX | 4000–4999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - NH | 4017 | PENACOOK | NH |
| 2012-04-18 | 603-565-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | PENACOOK | NH |
| — | 603-565-6XXX | 6000–6999 | Available | PENACOOK | NH | ||
| — | 603-565-7XXX | 7000–7999 | Available | PENACOOK | NH | ||
| — | 603-565-8XXX | 8000–8999 | Available | PENACOOK | NH | ||
| 2024-06-07 | 603-565-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | PENACOOK | NH |
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.