NumberResearchThousands-blocks in 603-519
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 603-519 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
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Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-10-04 | 603-519-0XXX | 0000–0999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | EXETER | NH |
| 2019-09-26 | 603-519-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | EXETER | NH |
| 2021-05-12 | 603-519-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | EXETER | NH |
| 2021-12-29 | 603-519-3XXX | 3000–3999 | Assigned | ONVOY, LLC - NH | 637E | EXETER | NH |
| 2019-06-07 | 603-519-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | EXETER | NH |
| 2021-04-21 | 603-519-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | EXETER | NH |
| 2021-04-21 | 603-519-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | EXETER | NH |
| 2020-10-27 | 603-519-7XXX | 7000–7999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | EXETER | NH |
| 2019-08-20 | 603-519-8XXX | 8000–8999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | EXETER | NH |
| 2021-07-07 | 603-519-9XXX | 9000–9999 | Assigned | ONVOY, LLC - NH | 637E | EXETER | NH |
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.