NumberResearchRecent thousands-block assignments
5 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 520
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 |
|---|---|---|---|---|---|---|---|
| 2008-08-13 | 520-445-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-08-13 | 520-873-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-08-04 | 520-368-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DOUGLAS | AZ |
| 2008-08-01 | 520-878-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | TUCSON | AZ |
| 2008-07-28 | 520-445-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2008-07-17 | 520-366-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BISBEE | AZ |
| 2008-07-16 | 520-858-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | CASAGRANDE | AZ |
| 2008-07-15 | 520-445-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-07-15 | 520-445-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-07-14 | 520-264-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NOGALES | AZ |
| 2008-07-09 | 520-445-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-07-08 | 520-445-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2008-07-08 | 520-445-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2008-06-25 | 520-368-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DOUGLAS | AZ |
| 2008-06-25 | 520-638-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-06-25 | 520-638-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-06-25 | 520-638-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-06-25 | 520-638-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2008-06-25 | 520-732-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SIERRAVIST | AZ |
| 2008-06-25 | 520-838-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2008-06-20 | 520-509-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | CASAGRANDE | AZ |
| 2008-06-20 | 520-509-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | CASAGRANDE | AZ |
| 2008-06-11 | 520-414-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2008-06-09 | 520-303-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-06-06 | 520-265-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | BENSON | AZ |
| 2008-06-06 | 520-494-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2008-05-30 | 520-840-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2008-05-30 | 520-896-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | SAN MANUEL | AZ |
| 2008-05-27 | 520-720-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | BENSON | AZ |
| 2008-05-22 | 520-269-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-05-22 | 520-468-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2008-05-19 | 520-350-1XXX | 1000–1999 | Assigned | GILA LOCAL EXCHANGE CARRIER, INC. - AZ | 947E | CASAGRANDE | AZ |
| 2008-05-06 | 520-305-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2008-05-02 | 520-265-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | BENSON | AZ |
| 2008-05-02 | 520-303-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2008-05-02 | 520-303-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2008-05-02 | 520-303-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2008-05-02 | 520-303-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2008-05-02 | 520-638-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-638-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2008-05-02 | 520-841-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | NOGALES | AZ |
| 2008-05-01 | 520-464-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2008-05-01 | 520-509-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2008-04-29 | 520-254-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | WILLCOX | AZ |
| 2008-04-25 | 520-342-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TUCSON | AZ |
| 2008-04-25 | 520-395-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TUCSON | AZ |
| 2008-04-25 | 520-395-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TUCSON | 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.