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 |
|---|---|---|---|---|---|---|---|
| 2007-10-26 | 623-239-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-10-26 | 623-239-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-10-26 | 623-239-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-10-24 | 623-239-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-10-15 | 623-302-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2007-10-10 | 623-239-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-10-08 | 623-251-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-10-08 | 623-251-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-10-08 | 623-251-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-10-08 | 623-251-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-10-08 | 623-251-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-10-08 | 623-251-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-09-21 | 623-251-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2007-09-13 | 623-565-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-12 | 623-239-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-09-12 | 623-239-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-09-12 | 623-252-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-12 | 623-252-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-12 | 623-252-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-12 | 623-252-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-12 | 623-252-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-12 | 623-252-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-12 | 623-252-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-07 | 623-237-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2007-09-07 | 623-251-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2007-08-29 | 623-565-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | PHOENIX | AZ |
| 2007-08-23 | 623-237-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2007-08-17 | 623-237-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2007-08-10 | 623-565-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-08-10 | 623-565-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-07-27 | 623-237-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-27 | 623-237-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-27 | 623-237-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-27 | 623-237-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2007-07-11 | 623-565-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-07-11 | 623-565-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-07-11 | 623-565-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-07-11 | 623-565-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-06-29 | 623-565-5XXX | 5000–5999 | Assigned | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7175 | PHOENIX | AZ |
| 2007-06-28 | 623-237-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2007-06-28 | 623-237-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2007-06-28 | 623-237-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2007-06-28 | 623-249-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-06-28 | 623-249-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-06-28 | 623-249-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-06-28 | 623-249-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-06-28 | 623-249-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-06-28 | 623-249-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2007-06-14 | 623-249-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2007-06-12 | 623-249-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | 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.