NumberResearchThousands-blocks in 603-515
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 603-515 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-03-29 | 603-515-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | WOLFEBORO | NH |
| 2008-03-20 | 603-515-1XXX | 1000–1999 | Assigned | IDT AMERICA, CORP. - NH | 314C | WOLFEBORO | NH |
| 2005-09-12 | 603-515-2XXX | 2000–2999 | Assigned | FREEDOM RING COMMUNICATIONS, LLC | 8468 | WOLFEBORO | NH |
| — | 603-515-3XXX | 3000–3999 | Reserved | CONSOLIDATED COMM OF NO. NEW ENGLAND-NH | 5113 | WOLFEBORO | NH |
| 2002-09-09 | 603-515-4XXX | 4000–4999 | Assigned | OTEL TELEKOM, INC. - NH | 9827 | WOLFEBORO | NH |
| 2023-09-19 | 603-515-5XXX | 5000–5999 | Assigned | TELNYX LLC | 073H | WOLFEBORO | NH |
| 2008-12-19 | 603-515-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | WOLFEBORO | NH |
| 2012-07-30 | 603-515-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | WOLFEBORO | NH |
| 2010-07-08 | 603-515-8XXX | 8000–8999 | Assigned | OTEL TELEKOM, INC. - NH | 9827 | WOLFEBORO | NH |
| 2000-05-05 | 603-515-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | WOLFEBORO | 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.