NumberResearchRecent thousands-block assignments
5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 |
|---|---|---|---|---|---|---|---|
| 2007-08-02 | 520-342-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2007-07-26 | 520-342-1XXX | 1000–1999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | TUCSON | AZ |
| 2007-07-26 | 520-342-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | TUCSON | AZ |
| 2007-07-26 | 520-342-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | TUCSON | AZ |
| 2007-07-13 | 520-302-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2007-07-13 | 520-732-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2007-07-12 | 520-414-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2007-07-11 | 520-300-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2007-07-11 | 520-300-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2007-07-11 | 520-300-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2007-06-28 | 520-300-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2007-06-28 | 520-300-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2007-06-28 | 520-414-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2007-06-27 | 520-988-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NOGALES | AZ |
| 2007-06-27 | 520-988-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NOGALES | AZ |
| 2007-06-20 | 520-866-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2007-06-08 | 520-443-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2007-06-07 | 520-302-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2007-06-05 | 520-509-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | CASAGRANDE | AZ |
| 2007-05-31 | 520-866-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2007-05-31 | 520-866-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2007-05-31 | 520-866-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2007-05-24 | 520-343-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2007-05-24 | 520-343-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2007-05-24 | 520-395-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2007-05-15 | 520-269-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2007-05-15 | 520-302-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2007-05-15 | 520-840-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2007-05-15 | 520-873-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2007-05-11 | 520-302-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2007-05-11 | 520-302-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2007-05-09 | 520-301-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2007-05-09 | 520-301-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2007-05-08 | 520-220-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | SIERRAVIST | AZ |
| 2007-05-08 | 520-366-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | BISBEE | AZ |
| 2007-05-08 | 520-827-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | SUPERIOR | AZ |
| 2007-05-07 | 520-269-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2007-05-07 | 520-269-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2007-04-30 | 520-732-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2007-04-30 | 520-732-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | SIERRAVIST | AZ |
| 2007-04-26 | 520-254-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | WILLCOX | AZ |
| 2007-04-26 | 520-265-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | BENSON | AZ |
| 2007-04-26 | 520-363-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | HAYDEN | AZ |
| 2007-04-26 | 520-394-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | NOGALES | AZ |
| 2007-04-26 | 520-457-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | TOMBSTONE | AZ |
| 2007-04-26 | 520-727-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | DOUGLAS | AZ |
| 2007-04-26 | 520-896-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | SAN MANUEL | AZ |
| 2007-04-25 | 520-233-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2007-04-25 | 520-463-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | WHITLOW | AZ |
| 2007-04-19 | 520-732-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | 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.