NumberResearchThousands-blocks in 603-210
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 603-210 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-12-04 | 603-210-0XXX | 0000–0999 | Assigned | OTEL TELEKOM, INC. - NH | 9827 | SUNCOOK | NH |
| — | 603-210-1XXX | 1000–1999 | Reserved | COMCAST IP PHONE, LLC | 318J | SUNCOOK | NH |
| — | 603-210-2XXX | 2000–2999 | Reserved | COMCAST IP PHONE, LLC | 318J | SUNCOOK | NH |
| 2017-05-03 | 603-210-3XXX | 3000–3999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | SUNCOOK | NH |
| 2002-09-07 | 603-210-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - NH | 996E | SUNCOOK | NH |
| — | 603-210-5XXX | 5000–5999 | Reserved | COMCAST IP PHONE, LLC | 318J | SUNCOOK | NH |
| 2002-10-23 | 603-210-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - NH | 8299 | SUNCOOK | NH |
| 2020-02-18 | 603-210-7XXX | 7000–7999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | SUNCOOK | NH |
| 2019-08-20 | 603-210-8XXX | 8000–8999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | SUNCOOK | NH |
| 2019-08-20 | 603-210-9XXX | 9000–9999 | Assigned | BELL ATLANTIC MOBILE, INC | 6386 | SUNCOOK | 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.