NumberResearchRecent thousands-block assignments
5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 |
|---|---|---|---|---|---|---|---|
| 2016-02-24 | 520-348-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | WILLCOX | AZ |
| 2016-02-24 | 520-357-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | HAYDEN | AZ |
| 2016-02-24 | 520-636-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | SAN MANUEL | AZ |
| 2016-02-24 | 520-636-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | SAN MANUEL | AZ |
| 2016-02-23 | 520-719-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | TUCSON | AZ |
| 2016-02-17 | 520-645-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | DOUGLAS | AZ |
| 2016-02-08 | 520-263-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | SIERRAVIST | AZ |
| 2016-02-08 | 520-263-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | SIERRAVIST | AZ |
| 2016-02-08 | 520-619-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | NOGALES | AZ |
| 2016-02-08 | 520-839-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | NOGALES | AZ |
| 2016-02-03 | 520-278-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2016-02-03 | 520-639-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2016-01-29 | 520-595-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BENSON | AZ |
| 2016-01-27 | 520-217-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2016-01-27 | 520-217-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2016-01-22 | 520-639-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2016-01-14 | 520-470-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | NOGALES | AZ |
| 2016-01-12 | 520-528-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2016-01-12 | 520-639-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2016-01-12 | 520-639-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2016-01-12 | 520-639-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2016-01-12 | 520-639-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2016-01-11 | 520-278-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-12-30 | 520-217-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | CASAGRANDE | AZ |
| 2015-12-30 | 520-278-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2015-12-18 | 520-719-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2015-12-18 | 520-719-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | TUCSON | AZ |
| 2015-12-10 | 520-263-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SIERRAVIST | AZ |
| 2015-12-10 | 520-422-3XXX | 3000–3999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BISBEE | AZ |
| 2015-12-10 | 520-719-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-12-10 | 520-719-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-23 | 520-214-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-18 | 520-251-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2015-11-18 | 520-528-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-11-18 | 520-528-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-11-18 | 520-788-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ |
| 2015-11-18 | 520-900-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-11-18 | 520-900-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-11-18 | 520-900-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2015-11-18 | 520-900-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2015-11-18 | 520-900-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.