NumberResearchThousands-blocks in 623-302
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 623-302 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 623 blocks
Most active assignees, all time — NPA 623
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2007-10-15 | 623-302-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2008-01-15 | 623-302-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2008-01-15 | 623-302-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2008-09-26 | 623-302-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2008-10-30 | 623-302-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2008-11-25 | 623-302-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2008-03-03 | 623-302-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2008-11-25 | 623-302-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2008-04-02 | 623-302-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2008-11-25 | 623-302-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
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.