NumberResearchRecent thousands-block assignments
2 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, last 30 days — NPA 623
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 |
|---|---|---|---|---|---|---|---|
| 2015-07-29 | 623-499-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-07-29 | 623-499-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-07-08 | 623-285-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2015-07-08 | 623-285-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2015-07-08 | 623-285-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2015-06-26 | 623-228-0XXX | 0000–0999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-26 | 623-228-9XXX | 9000–9999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | PHOENIX | AZ |
| 2015-06-17 | 623-499-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-06-02 | 623-522-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | PHOENIX | AZ |
| 2015-06-02 | 623-522-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | PHOENIX | AZ |
| 2015-06-02 | 623-522-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | PHOENIX | AZ |
| 2015-06-02 | 623-522-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | PHOENIX | AZ |
| 2015-06-02 | 623-522-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | PHOENIX | AZ |
| 2015-05-26 | 623-285-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2015-05-26 | 623-285-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2015-05-26 | 623-285-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2015-04-15 | 623-633-7XXX | 7000–7999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | PHOENIX | AZ |
| 2015-03-31 | 623-296-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-31 | 623-296-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-23 | 623-900-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2015-03-23 | 623-900-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2015-03-23 | 623-900-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2015-03-23 | 623-900-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2015-03-23 | 623-900-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2015-03-23 | 623-900-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2015-03-06 | 623-219-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-219-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-219-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-219-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-633-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-759-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-759-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-759-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2015-03-06 | 623-759-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
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.