NumberResearchThousands-blocks in 603-484
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 603-484 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 |
|---|---|---|---|---|---|---|---|
| 2017-07-17 | 603-484-0XXX | 0000–0999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | NASHUA | NH |
| 2018-08-01 | 603-484-1XXX | 1000–1999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | NASHUA | NH |
| 2020-09-14 | 603-484-2XXX | 2000–2999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | NASHUA | NH |
| 2017-12-22 | 603-484-3XXX | 3000–3999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | NASHUA | NH |
| 2016-11-16 | 603-484-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | NASHUA | NH |
| 2019-08-20 | 603-484-5XXX | 5000–5999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | NASHUA | NH |
| 2019-04-01 | 603-484-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | NASHUA | NH |
| 2017-05-15 | 603-484-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NASHUA | NH |
| 2018-02-28 | 603-484-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF NEW HAMPSHIRE, LLC - NH | 927H | NASHUA | NH |
| 2018-09-07 | 603-484-9XXX | 9000–9999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | NASHUA | 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.