NumberResearchThousands-blocks in 475-227
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 475-227 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 475 blocks
Most active assignees, all time — NPA 475
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-03-13 | 475-227-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | NEW HAVEN | CT |
| 2013-08-14 | 475-227-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 6388 | NEW HAVEN | CT |
| 2011-06-27 | 475-227-2XXX | 2000–2999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2012-10-11 | 475-227-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | NEW HAVEN | CT |
| 2011-06-14 | 475-227-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | NEW HAVEN | CT |
| 2011-06-14 | 475-227-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | NEW HAVEN | CT |
| 2011-06-14 | 475-227-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | NEW HAVEN | CT |
| 2011-06-14 | 475-227-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | NEW HAVEN | CT |
| 2014-06-03 | 475-227-8XXX | 8000–8999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2011-06-14 | 475-227-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | NEW HAVEN | CT |
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.