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 |
|---|---|---|---|---|---|---|---|
| 2004-03-08 | 520-280-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2004-03-08 | 520-280-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2004-02-19 | 520-234-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2004-01-29 | 520-234-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2004-01-27 | 520-207-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2004-01-27 | 520-207-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-12-23 | 520-234-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2003-12-11 | 520-203-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2003-12-05 | 520-204-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | TUCSON | AZ |
| 2003-11-04 | 520-234-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2003-10-28 | 520-398-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-10-28 | 520-398-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-10-13 | 520-874-0XXX | 0000–0999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-1XXX | 1000–1999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-5XXX | 5000–5999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-6XXX | 6000–6999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-13 | 520-874-9XXX | 9000–9999 | Assigned | QWEST CORPORATION | 9636 | TUCSON | AZ |
| 2003-10-09 | 520-260-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2003-10-09 | 520-730-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2003-10-09 | 520-730-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2003-10-09 | 520-730-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2003-10-09 | 520-904-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2003-10-08 | 520-393-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-10-08 | 520-393-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-09-05 | 520-203-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2003-09-05 | 520-205-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2003-09-05 | 520-205-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2003-09-03 | 520-423-4XXX | 4000–4999 | Assigned | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7175 | CASAGRANDE | AZ |
| 2003-08-19 | 520-423-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2003-08-13 | 520-203-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2003-08-05 | 520-223-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2003-08-05 | 520-313-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2003-07-28 | 520-207-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-07-28 | 520-207-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-07-28 | 520-207-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2003-07-28 | 520-234-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2003-07-28 | 520-234-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2003-06-04 | 520-456-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2003-06-02 | 520-205-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2003-04-30 | 520-313-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2003-04-30 | 520-313-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2003-04-30 | 520-313-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2003-04-30 | 520-313-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2003-04-14 | 520-456-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SIERRAVIST | AZ |
| 2003-04-14 | 520-456-6XXX | 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.