NumberResearchThousands-blocks in 203-408
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 203-408 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 203 blocks
Most active assignees, all time — NPA 203
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-10-26 | 203-408-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CT | 199F | REDDING | CT |
| 2013-04-04 | 203-408-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF CONNECTICUT, LLC - CT | 539F | REDDING | CT |
| 2014-01-15 | 203-408-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CT | 199F | REDDING | CT |
| 2015-04-27 | 203-408-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CT | 199F | REDDING | CT |
| 2022-07-07 | 203-408-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | REDDING | CT |
| 2011-06-23 | 203-408-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | REDDING | CT |
| 2016-02-26 | 203-408-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CT | 639C | REDDING | CT |
| 2016-04-18 | 203-408-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CT | 639C | REDDING | CT |
| 2013-04-04 | 203-408-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF CONNECTICUT, LLC - CT | 539F | REDDING | CT |
| 2016-11-14 | 203-408-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CONNECTICUT, LLC - CT | 539F | REDDING | CT |
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.