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 |
|---|---|---|---|---|---|---|---|
| 2006-08-01 | 623-670-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2006-08-01 | 623-687-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2006-08-01 | 623-691-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2006-08-01 | 623-734-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2006-08-01 | 623-748-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2006-07-20 | 623-313-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-07-20 | 623-313-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-07-20 | 623-313-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-07-20 | 623-313-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-07-20 | 623-313-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-07-20 | 623-313-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-07-20 | 623-313-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2006-07-20 | 623-444-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-06-08 | 623-824-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2006-06-02 | 623-262-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-06-02 | 623-262-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-05-30 | 623-262-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2006-05-18 | 623-242-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2006-05-18 | 623-242-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2006-05-18 | 623-242-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2006-05-18 | 623-242-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2006-05-18 | 623-455-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2006-05-18 | 623-455-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2006-05-18 | 623-455-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | PHOENIX | AZ |
| 2006-05-17 | 623-242-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-05-15 | 623-313-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PHOENIX | AZ |
| 2006-05-15 | 623-313-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PHOENIX | AZ |
| 2006-05-08 | 623-242-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2006-05-08 | 623-242-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2006-05-08 | 623-242-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-05-04 | 623-242-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2006-05-04 | 623-262-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2006-05-04 | 623-262-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2006-05-04 | 623-262-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2006-05-04 | 623-262-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2006-05-04 | 623-262-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | PHOENIX | AZ |
| 2006-04-07 | 623-313-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PHOENIX | AZ |
| 2006-04-07 | 623-455-4XXX | 4000–4999 | Assigned | ACCIPITER COMMUNICATIONS INC | 2191 | PHOENIX | AZ |
| 2006-04-03 | 623-455-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-04-03 | 623-455-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-04-03 | 623-455-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-03-28 | 623-455-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2006-02-28 | 623-698-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-02-28 | 623-698-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-02-28 | 623-698-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-02-28 | 623-698-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-02-28 | 623-698-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-02-28 | 623-698-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2006-02-17 | 623-879-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PHOENIX | AZ |
| 2006-02-09 | 623-388-1XXX | 1000–1999 | 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.