NumberResearchThousands-blocks in 603-680
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 603-680 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 |
|---|---|---|---|---|---|---|---|
| — | 603-680-0XXX | 0000–0999 | Reserved | UNITED STATES CELLULAR - NH | 6290 | HILLSBORO | NH |
| — | 603-680-1XXX | 1000–1999 | Reserved | UNITED STATES CELLULAR - NH | 6290 | HILLSBORO | NH |
| — | 603-680-2XXX | 2000–2999 | Available | HILLSBORO | NH | ||
| 2016-07-12 | 603-680-3XXX | 3000–3999 | Assigned | FIDIUM ENTERPRISE SERVICES, LLC | 631H | HILLSBORO | NH |
| 2009-11-19 | 603-680-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | HILLSBORO | NH |
| 2019-11-13 | 603-680-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | HILLSBORO | NH |
| 2019-11-13 | 603-680-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | HILLSBORO | NH |
| 2024-06-20 | 603-680-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | HILLSBORO | NH |
| 2020-09-25 | 603-680-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - NH | 8299 | HILLSBORO | NH |
| 2016-05-03 | 603-680-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - NH | 6290 | HILLSBORO | 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.