NumberResearchThousands-blocks in 603-283
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 603-283 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2000-06-23 | 603-283-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | KEENE | NH |
| 2001-03-28 | 603-283-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | KEENE | NH |
| 2006-02-14 | 603-283-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | KEENE | NH |
| 2006-08-25 | 603-283-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | KEENE | NH |
| — | 603-283-4XXX | 4000–4999 | Available | KEENE | NH | ||
| 2007-03-01 | 603-283-5XXX | 5000–5999 | Assigned | FREEDOM RING COMMUNICATIONS, LLC | 8468 | KEENE | NH |
| — | 603-283-6XXX | 6000–6999 | Reserved | PAETEC ITEL, LLC | 829J | KEENE | NH |
| — | 603-283-7XXX | 7000–7999 | Reserved | PAETEC ITEL, LLC | 829J | KEENE | NH |
| 2008-12-19 | 603-283-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | KEENE | NH |
| 2005-10-28 | 603-283-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | KEENE | 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.