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 |
|---|---|---|---|---|---|---|---|
| 2017-08-30 | 520-274-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2017-08-21 | 520-462-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-21 | 520-462-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-08-15 | 520-354-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2017-08-15 | 520-354-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2017-08-15 | 520-354-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | TUCSON | AZ |
| 2017-08-14 | 520-317-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | HAYDEN | AZ |
| 2017-08-14 | 520-317-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | HAYDEN | AZ |
| 2017-08-09 | 520-402-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BENSON | AZ |
| 2017-07-27 | 520-685-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | SIERRAVIST | AZ |
| 2017-07-20 | 520-685-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2017-07-20 | 520-987-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | NOGALES | AZ |
| 2017-07-17 | 520-367-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | TUCSON | AZ |
| 2017-07-06 | 520-526-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2017-07-06 | 520-526-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2017-06-12 | 520-526-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | TUCSON | AZ |
| 2017-06-12 | 520-526-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2017-06-09 | 520-685-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | SIERRAVIST | AZ |
| 2017-06-06 | 520-274-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2017-06-01 | 520-274-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | TUCSON | AZ |
| 2017-05-30 | 520-597-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | SUPERIOR | AZ |
| 2017-05-23 | 520-457-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | TOMBSTONE | AZ |
| 2017-05-23 | 520-636-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | SAN MANUEL | AZ |
| 2017-05-23 | 520-833-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | TUCSON | AZ |
| 2017-05-22 | 520-317-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | HAYDEN | AZ |
| 2017-05-22 | 520-340-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | CASAGRANDE | AZ |
| 2017-05-22 | 520-341-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | NOGALES | AZ |
| 2017-05-22 | 520-989-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2017-05-01 | 520-526-6XXX | 6000–6999 | Assigned | COMMIO, LLC | 939H | TUCSON | AZ |
| 2017-04-28 | 520-341-3XXX | 3000–3999 | Assigned | MCC TELEPHONY LLC | 593K | NOGALES | AZ |
| 2017-04-26 | 520-274-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2017-03-29 | 520-340-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | CASAGRANDE | AZ |
| 2017-03-29 | 520-989-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TUCSON | AZ |
| 2017-03-14 | 520-347-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2017-03-14 | 520-347-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2017-03-13 | 520-347-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | TUCSON | AZ |
| 2017-03-13 | 520-895-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | SIERRAVIST | AZ |
| 2017-03-07 | 520-217-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | CASAGRANDE | AZ |
| 2017-03-07 | 520-340-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | CASAGRANDE | AZ |
| 2017-03-07 | 520-347-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2017-02-15 | 520-402-8XXX | 8000–8999 | Assigned | VALLEY CONNECTIONS, L.L.C. - AZ | 183D | BENSON | AZ |
| 2017-02-13 | 520-347-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | 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.