NumberResearchThousands-blocks in 203-308
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 203-308 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-10-22 | 203-308-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 6388 | ANSONIDRBY | CT |
| 2009-03-13 | 203-308-1XXX | 1000–1999 | Assigned | OMNIPOINT COMMUNICATIONS, INC. - CT | 6624 | ANSONIDRBY | CT |
| 2010-07-12 | 203-308-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | ANSONIDRBY | CT |
| 2009-07-16 | 203-308-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ANSONIDRBY | CT |
| 2009-10-19 | 203-308-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | ANSONIDRBY | CT |
| 2010-08-10 | 203-308-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CT | 199F | ANSONIDRBY | CT |
| 2010-08-27 | 203-308-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ANSONIDRBY | CT |
| 2010-07-09 | 203-308-7XXX | 7000–7999 | Assigned | OMNIPOINT COMMUNICATIONS, INC. - CT | 6624 | ANSONIDRBY | CT |
| 2010-03-03 | 203-308-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS, INC. - CT | 6624 | ANSONIDRBY | CT |
| 2009-12-22 | 203-308-9XXX | 9000–9999 | Assigned | OMNIPOINT COMMUNICATIONS, INC. - CT | 6624 | ANSONIDRBY | 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.