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 |
|---|---|---|---|---|---|---|---|
| 2008-04-22 | 520-424-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASAGRANDE | AZ |
| 2008-04-21 | 520-464-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2008-04-21 | 520-709-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2008-04-21 | 520-709-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2008-04-16 | 520-254-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | WILLCOX | AZ |
| 2008-04-16 | 520-827-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | SUPERIOR | AZ |
| 2008-03-13 | 520-423-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2008-03-12 | 520-282-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-12 | 520-301-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-12 | 520-305-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-12 | 520-305-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-12 | 520-344-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-12 | 520-351-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-12 | 520-351-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-12 | 520-443-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-03-06 | 520-344-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | TUCSON | AZ |
| 2008-03-05 | 520-351-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | 7552 | TUCSON | AZ |
| 2008-03-03 | 520-300-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2008-02-22 | 520-445-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-02-22 | 520-445-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-02-22 | 520-445-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-02-21 | 520-254-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WILLCOX | AZ |
| 2008-02-19 | 520-443-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TUCSON | AZ |
| 2008-02-19 | 520-443-3XXX | 3000–3999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TUCSON | AZ |
| 2008-02-19 | 520-443-4XXX | 4000–4999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TUCSON | AZ |
| 2008-02-15 | 520-432-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | BISBEE | AZ |
| 2008-02-14 | 520-395-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-02-14 | 520-395-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-02-13 | 520-305-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-02-13 | 520-305-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-02-13 | 520-838-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-02-12 | 520-344-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2008-02-08 | 520-342-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-02-08 | 520-342-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-02-07 | 520-395-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-02-07 | 520-395-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-02-07 | 520-395-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2008-02-01 | 520-423-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2008-01-29 | 520-305-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2008-01-29 | 520-305-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2008-01-29 | 520-709-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | CASAGRANDE | AZ |
| 2008-01-28 | 520-282-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2008-01-28 | 520-282-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2008-01-24 | 520-342-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2008-01-18 | 520-988-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | NOGALES | AZ |
| 2008-01-11 | 520-455-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NOGALES | AZ |
| 2008-01-11 | 520-455-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | NOGALES | AZ |
| 2008-01-07 | 520-305-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2008-01-07 | 520-305-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2008-01-04 | 520-303-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | 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.